Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California
The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca....
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| creator | Busby, Cathy Graettinger, Alison López Martínez, Margarita Medynski, Sarah Niemi, Tina Andrews, Claire Bowman, Emilie Gutierrez, Evelyn P Henry, Matthew Lodes, Emma Ojeda, Judith Rice, Jonathan Andrews, Graham Brown, Sarah |
| description | The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca. 24-12 Ma), to rift magmatism, related to the opening of the Gulf of California (56% SiO2 and MgO |
| doi_str_mv | 10.1130/GES02094.1 |
| format | Article |
| fullrecord | <record><control><sourceid>geoscienceworld_cross</sourceid><recordid>TN_cdi_crossref_primary_10_1130_GES02094_1</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2020_067171</sourcerecordid><originalsourceid>FETCH-LOGICAL-a326t-a9c057f1e65a1bc5ef7d267562ac729abacbde83ea5dad6c0ffe778ca5d0427a3</originalsourceid><addsrcrecordid>eNpNkN1KAzEQhYMoWKs3PkGu1a35aTbdS1tqFQqCVfEuTLOJTdkmkmyRvoLv4lP4YqbUQmFgZg7fHIaD0CUlPUo5uZ2MZ4SRqt-jR6hDheAF6ZP344P5FJ2ltCSEV4KzDvp-C40G7zSORodY42BxuzAYoi7aUERnW9xG8Mm1LngcfFqEaPbUZA2bFSQ8hOQ8zrUVZ-BbwM8hQfP7A9nJwE0mG7u9GkHjbIjeZW0ISzgQztGJhSaZi__eRa_345fRQzF9mjyO7qYFcFa2BVSaCGmpKQXQuRbGypqVUpQMtGQVzEHPazPgBkQNdamJtUbKgc4r6TMJvIuudr46hpSiseozuhXEjaJEbVNU-xQVzfD1Dv4wIWlnvDZfITa1WoZ19PlNxTKqSCmppPwPuCh2mg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California</title><source>DOAJ Directory of Open Access Journals</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><creator>Busby, Cathy ; Graettinger, Alison ; López Martínez, Margarita ; Medynski, Sarah ; Niemi, Tina ; Andrews, Claire ; Bowman, Emilie ; Gutierrez, Evelyn P ; Henry, Matthew ; Lodes, Emma ; Ojeda, Judith ; Rice, Jonathan ; Andrews, Graham ; Brown, Sarah</creator><creatorcontrib>Busby, Cathy ; Graettinger, Alison ; López Martínez, Margarita ; Medynski, Sarah ; Niemi, Tina ; Andrews, Claire ; Bowman, Emilie ; Gutierrez, Evelyn P ; Henry, Matthew ; Lodes, Emma ; Ojeda, Judith ; Rice, Jonathan ; Andrews, Graham ; Brown, Sarah</creatorcontrib><description>The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca. 24-12 Ma), to rift magmatism, related to the opening of the Gulf of California (<12 Ma). In addition, a suite of postsubduction rocks (<12 Ma), referred to as "bajaites," are enriched in light rare-earth and other incompatible elements (e.g., Ba and Sr). These are further subdivided into high-magnesian andesite (with 50%-58% SiO2 and MgO >4%) and adakite (>56% SiO2 and MgO <3%). The bajaites correlate spatially with a fossil slab imaged under central Baja and are inferred to record postsubduction melting of the slab and subduction-modified mantle by asthenospheric upwelling associated with rifting or slab breakoff. We report on volcanic rocks of all three suites, which surround and underlie the Santa Rosalia sedimentary rift basin. This area represents the western margin of the Guaymas basin, the most magmatically robust segment of the Gulf of California rift, where seafloor spreading occurred in isolation for 3-4 m.y. (starting at 6 Ma) before transtensional pull-apart basins to the north and south ruptured the continental crust. Outcrops of the Santa Rosalia area thus offer the opportunity to understand the magmatic evolution of the Guaymas rift, which has been the focus of numerous oceanographic expeditions. We describe 21 distinct volcanic and hypabyssal map units in the Santa Rosalia area, using field characteristics, petrographic data, and major- and trace-element geochemical data, as well as zircon isotopic data and ten new 40Ar-39Ar ages. Lithofacies include lavas and lava domes, block-and-ash-flow tuffs, ignimbrites, and hypabyssal intrusions (plugs, dikes, and peperites). Calcalkaline volcanic rocks (13.81-10.11 Ma) pass conformably upsection, with no time gap, into volcanic rocks with rift transitional chemistry (9.69-8.84 Ma). The onset of rifting was marked by explosive eruption of silicic ignimbrite (tuff of El Morro), possibly from a caldera, similar to the onset of rifting or accelerated rifting in other parts of the Gulf of California. Epsilon Hf zircon data are consistent with a rift transitional setting for the tuff of El Morro. Arc and rift volcanic rocks were then juxtaposed by normal faults and tilted eastward toward a north-south fault that lay offshore, likely related to the north-south normal faults documented for the early history of the Guaymas basin, prior to the onset of northwest-southeast transtenional faulting. Magmatism in the Santa Rosalia area resumed with emplacement of high-magnesian andesite lavas and intrusions, at 6.06 Ma ±0.27 Ma, coeval with the onset of seafloor spreading in the Guaymas basin at ca. 6 Ma. The 9.69-8.84 Ma rift transitional volcanic rocks underlying the Santa Rosalia sedimentary basin provide a maximum age on its basal fill. Evaporites in the Santa Rosalia sedimentary basin formed on the margin of the Guaymas basin, where thicker evaporites formed. Overlying coarse-grained clastic sedimentary fill of the Santa Rosalia basin and its stratiform Cu-Co-Zn-Mn sulfides may have accumulated rapidly, coeval with emplacement of 6.06 Ma high-magnesian andesite intrusions and the ca. 6 Ma onset of seafloor spreading in the Guaymas basin.</description><identifier>ISSN: 1553-040X</identifier><identifier>EISSN: 1553-040X</identifier><identifier>DOI: 10.1130/GES02094.1</identifier><language>eng</language><publisher>Geological Society of America</publisher><subject>absolute age ; andesites ; Ar/Ar ; Baja California Sur Mexico ; Cenozoic ; chemical composition ; East Pacific ; Geochronology ; Guaymas Basin ; Gulf of California ; hafnium ; Hf-177/Hf-176 ; igneous and metamorphic rocks ; igneous rocks ; isotope ratios ; isotopes ; lithofacies ; lithostratigraphy ; magmatism ; mapping ; metals ; Mexico ; Miocene ; Neogene ; nesosilicates ; North Pacific ; Northeast Pacific ; orthosilicates ; Pacific Ocean ; Petrology ; plate tectonics ; rare earths ; rifting ; Santa Rosalia Mexico ; silicates ; spectra ; stable isotopes ; Tertiary ; trachyandesites ; U/Pb ; volcanic rocks ; X-ray fluorescence spectra ; zircon ; zircon group</subject><ispartof>Geosphere (Boulder, Colo.), 2020-08, Vol.16 (4), p.1012-1041</ispartof><rights>GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Reference includes data supplied by the Geological Society of America @Boulder, CO @USA @United States</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a326t-a9c057f1e65a1bc5ef7d267562ac729abacbde83ea5dad6c0ffe778ca5d0427a3</citedby><cites>FETCH-LOGICAL-a326t-a9c057f1e65a1bc5ef7d267562ac729abacbde83ea5dad6c0ffe778ca5d0427a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,27923,27924</link.rule.ids></links><search><creatorcontrib>Busby, Cathy</creatorcontrib><creatorcontrib>Graettinger, Alison</creatorcontrib><creatorcontrib>López Martínez, Margarita</creatorcontrib><creatorcontrib>Medynski, Sarah</creatorcontrib><creatorcontrib>Niemi, Tina</creatorcontrib><creatorcontrib>Andrews, Claire</creatorcontrib><creatorcontrib>Bowman, Emilie</creatorcontrib><creatorcontrib>Gutierrez, Evelyn P</creatorcontrib><creatorcontrib>Henry, Matthew</creatorcontrib><creatorcontrib>Lodes, Emma</creatorcontrib><creatorcontrib>Ojeda, Judith</creatorcontrib><creatorcontrib>Rice, Jonathan</creatorcontrib><creatorcontrib>Andrews, Graham</creatorcontrib><creatorcontrib>Brown, Sarah</creatorcontrib><title>Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California</title><title>Geosphere (Boulder, Colo.)</title><description>The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca. 24-12 Ma), to rift magmatism, related to the opening of the Gulf of California (<12 Ma). In addition, a suite of postsubduction rocks (<12 Ma), referred to as "bajaites," are enriched in light rare-earth and other incompatible elements (e.g., Ba and Sr). These are further subdivided into high-magnesian andesite (with 50%-58% SiO2 and MgO >4%) and adakite (>56% SiO2 and MgO <3%). The bajaites correlate spatially with a fossil slab imaged under central Baja and are inferred to record postsubduction melting of the slab and subduction-modified mantle by asthenospheric upwelling associated with rifting or slab breakoff. We report on volcanic rocks of all three suites, which surround and underlie the Santa Rosalia sedimentary rift basin. This area represents the western margin of the Guaymas basin, the most magmatically robust segment of the Gulf of California rift, where seafloor spreading occurred in isolation for 3-4 m.y. (starting at 6 Ma) before transtensional pull-apart basins to the north and south ruptured the continental crust. Outcrops of the Santa Rosalia area thus offer the opportunity to understand the magmatic evolution of the Guaymas rift, which has been the focus of numerous oceanographic expeditions. We describe 21 distinct volcanic and hypabyssal map units in the Santa Rosalia area, using field characteristics, petrographic data, and major- and trace-element geochemical data, as well as zircon isotopic data and ten new 40Ar-39Ar ages. Lithofacies include lavas and lava domes, block-and-ash-flow tuffs, ignimbrites, and hypabyssal intrusions (plugs, dikes, and peperites). Calcalkaline volcanic rocks (13.81-10.11 Ma) pass conformably upsection, with no time gap, into volcanic rocks with rift transitional chemistry (9.69-8.84 Ma). The onset of rifting was marked by explosive eruption of silicic ignimbrite (tuff of El Morro), possibly from a caldera, similar to the onset of rifting or accelerated rifting in other parts of the Gulf of California. Epsilon Hf zircon data are consistent with a rift transitional setting for the tuff of El Morro. Arc and rift volcanic rocks were then juxtaposed by normal faults and tilted eastward toward a north-south fault that lay offshore, likely related to the north-south normal faults documented for the early history of the Guaymas basin, prior to the onset of northwest-southeast transtenional faulting. Magmatism in the Santa Rosalia area resumed with emplacement of high-magnesian andesite lavas and intrusions, at 6.06 Ma ±0.27 Ma, coeval with the onset of seafloor spreading in the Guaymas basin at ca. 6 Ma. The 9.69-8.84 Ma rift transitional volcanic rocks underlying the Santa Rosalia sedimentary basin provide a maximum age on its basal fill. Evaporites in the Santa Rosalia sedimentary basin formed on the margin of the Guaymas basin, where thicker evaporites formed. Overlying coarse-grained clastic sedimentary fill of the Santa Rosalia basin and its stratiform Cu-Co-Zn-Mn sulfides may have accumulated rapidly, coeval with emplacement of 6.06 Ma high-magnesian andesite intrusions and the ca. 6 Ma onset of seafloor spreading in the Guaymas basin.</description><subject>absolute age</subject><subject>andesites</subject><subject>Ar/Ar</subject><subject>Baja California Sur Mexico</subject><subject>Cenozoic</subject><subject>chemical composition</subject><subject>East Pacific</subject><subject>Geochronology</subject><subject>Guaymas Basin</subject><subject>Gulf of California</subject><subject>hafnium</subject><subject>Hf-177/Hf-176</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>isotope ratios</subject><subject>isotopes</subject><subject>lithofacies</subject><subject>lithostratigraphy</subject><subject>magmatism</subject><subject>mapping</subject><subject>metals</subject><subject>Mexico</subject><subject>Miocene</subject><subject>Neogene</subject><subject>nesosilicates</subject><subject>North Pacific</subject><subject>Northeast Pacific</subject><subject>orthosilicates</subject><subject>Pacific Ocean</subject><subject>Petrology</subject><subject>plate tectonics</subject><subject>rare earths</subject><subject>rifting</subject><subject>Santa Rosalia Mexico</subject><subject>silicates</subject><subject>spectra</subject><subject>stable isotopes</subject><subject>Tertiary</subject><subject>trachyandesites</subject><subject>U/Pb</subject><subject>volcanic rocks</subject><subject>X-ray fluorescence spectra</subject><subject>zircon</subject><subject>zircon group</subject><issn>1553-040X</issn><issn>1553-040X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNpNkN1KAzEQhYMoWKs3PkGu1a35aTbdS1tqFQqCVfEuTLOJTdkmkmyRvoLv4lP4YqbUQmFgZg7fHIaD0CUlPUo5uZ2MZ4SRqt-jR6hDheAF6ZP344P5FJ2ltCSEV4KzDvp-C40G7zSORodY42BxuzAYoi7aUERnW9xG8Mm1LngcfFqEaPbUZA2bFSQ8hOQ8zrUVZ-BbwM8hQfP7A9nJwE0mG7u9GkHjbIjeZW0ISzgQztGJhSaZi__eRa_345fRQzF9mjyO7qYFcFa2BVSaCGmpKQXQuRbGypqVUpQMtGQVzEHPazPgBkQNdamJtUbKgc4r6TMJvIuudr46hpSiseozuhXEjaJEbVNU-xQVzfD1Dv4wIWlnvDZfITa1WoZ19PlNxTKqSCmppPwPuCh2mg</recordid><startdate>20200801</startdate><enddate>20200801</enddate><creator>Busby, Cathy</creator><creator>Graettinger, Alison</creator><creator>López Martínez, Margarita</creator><creator>Medynski, Sarah</creator><creator>Niemi, Tina</creator><creator>Andrews, Claire</creator><creator>Bowman, Emilie</creator><creator>Gutierrez, Evelyn P</creator><creator>Henry, Matthew</creator><creator>Lodes, Emma</creator><creator>Ojeda, Judith</creator><creator>Rice, Jonathan</creator><creator>Andrews, Graham</creator><creator>Brown, Sarah</creator><general>Geological Society of America</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20200801</creationdate><title>Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California</title><author>Busby, Cathy ; Graettinger, Alison ; López Martínez, Margarita ; Medynski, Sarah ; Niemi, Tina ; Andrews, Claire ; Bowman, Emilie ; Gutierrez, Evelyn P ; Henry, Matthew ; Lodes, Emma ; Ojeda, Judith ; Rice, Jonathan ; Andrews, Graham ; Brown, Sarah</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a326t-a9c057f1e65a1bc5ef7d267562ac729abacbde83ea5dad6c0ffe778ca5d0427a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>absolute age</topic><topic>andesites</topic><topic>Ar/Ar</topic><topic>Baja California Sur Mexico</topic><topic>Cenozoic</topic><topic>chemical composition</topic><topic>East Pacific</topic><topic>Geochronology</topic><topic>Guaymas Basin</topic><topic>Gulf of California</topic><topic>hafnium</topic><topic>Hf-177/Hf-176</topic><topic>igneous and metamorphic rocks</topic><topic>igneous rocks</topic><topic>isotope ratios</topic><topic>isotopes</topic><topic>lithofacies</topic><topic>lithostratigraphy</topic><topic>magmatism</topic><topic>mapping</topic><topic>metals</topic><topic>Mexico</topic><topic>Miocene</topic><topic>Neogene</topic><topic>nesosilicates</topic><topic>North Pacific</topic><topic>Northeast Pacific</topic><topic>orthosilicates</topic><topic>Pacific Ocean</topic><topic>Petrology</topic><topic>plate tectonics</topic><topic>rare earths</topic><topic>rifting</topic><topic>Santa Rosalia Mexico</topic><topic>silicates</topic><topic>spectra</topic><topic>stable isotopes</topic><topic>Tertiary</topic><topic>trachyandesites</topic><topic>U/Pb</topic><topic>volcanic rocks</topic><topic>X-ray fluorescence spectra</topic><topic>zircon</topic><topic>zircon group</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Busby, Cathy</creatorcontrib><creatorcontrib>Graettinger, Alison</creatorcontrib><creatorcontrib>López Martínez, Margarita</creatorcontrib><creatorcontrib>Medynski, Sarah</creatorcontrib><creatorcontrib>Niemi, Tina</creatorcontrib><creatorcontrib>Andrews, Claire</creatorcontrib><creatorcontrib>Bowman, Emilie</creatorcontrib><creatorcontrib>Gutierrez, Evelyn P</creatorcontrib><creatorcontrib>Henry, Matthew</creatorcontrib><creatorcontrib>Lodes, Emma</creatorcontrib><creatorcontrib>Ojeda, Judith</creatorcontrib><creatorcontrib>Rice, Jonathan</creatorcontrib><creatorcontrib>Andrews, Graham</creatorcontrib><creatorcontrib>Brown, Sarah</creatorcontrib><collection>CrossRef</collection><jtitle>Geosphere (Boulder, Colo.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Busby, Cathy</au><au>Graettinger, Alison</au><au>López Martínez, Margarita</au><au>Medynski, Sarah</au><au>Niemi, Tina</au><au>Andrews, Claire</au><au>Bowman, Emilie</au><au>Gutierrez, Evelyn P</au><au>Henry, Matthew</au><au>Lodes, Emma</au><au>Ojeda, Judith</au><au>Rice, Jonathan</au><au>Andrews, Graham</au><au>Brown, Sarah</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California</atitle><jtitle>Geosphere (Boulder, Colo.)</jtitle><date>2020-08-01</date><risdate>2020</risdate><volume>16</volume><issue>4</issue><spage>1012</spage><epage>1041</epage><pages>1012-1041</pages><issn>1553-040X</issn><eissn>1553-040X</eissn><abstract>The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca. 24-12 Ma), to rift magmatism, related to the opening of the Gulf of California (<12 Ma). In addition, a suite of postsubduction rocks (<12 Ma), referred to as "bajaites," are enriched in light rare-earth and other incompatible elements (e.g., Ba and Sr). These are further subdivided into high-magnesian andesite (with 50%-58% SiO2 and MgO >4%) and adakite (>56% SiO2 and MgO <3%). The bajaites correlate spatially with a fossil slab imaged under central Baja and are inferred to record postsubduction melting of the slab and subduction-modified mantle by asthenospheric upwelling associated with rifting or slab breakoff. We report on volcanic rocks of all three suites, which surround and underlie the Santa Rosalia sedimentary rift basin. This area represents the western margin of the Guaymas basin, the most magmatically robust segment of the Gulf of California rift, where seafloor spreading occurred in isolation for 3-4 m.y. (starting at 6 Ma) before transtensional pull-apart basins to the north and south ruptured the continental crust. Outcrops of the Santa Rosalia area thus offer the opportunity to understand the magmatic evolution of the Guaymas rift, which has been the focus of numerous oceanographic expeditions. We describe 21 distinct volcanic and hypabyssal map units in the Santa Rosalia area, using field characteristics, petrographic data, and major- and trace-element geochemical data, as well as zircon isotopic data and ten new 40Ar-39Ar ages. Lithofacies include lavas and lava domes, block-and-ash-flow tuffs, ignimbrites, and hypabyssal intrusions (plugs, dikes, and peperites). Calcalkaline volcanic rocks (13.81-10.11 Ma) pass conformably upsection, with no time gap, into volcanic rocks with rift transitional chemistry (9.69-8.84 Ma). The onset of rifting was marked by explosive eruption of silicic ignimbrite (tuff of El Morro), possibly from a caldera, similar to the onset of rifting or accelerated rifting in other parts of the Gulf of California. Epsilon Hf zircon data are consistent with a rift transitional setting for the tuff of El Morro. Arc and rift volcanic rocks were then juxtaposed by normal faults and tilted eastward toward a north-south fault that lay offshore, likely related to the north-south normal faults documented for the early history of the Guaymas basin, prior to the onset of northwest-southeast transtenional faulting. Magmatism in the Santa Rosalia area resumed with emplacement of high-magnesian andesite lavas and intrusions, at 6.06 Ma ±0.27 Ma, coeval with the onset of seafloor spreading in the Guaymas basin at ca. 6 Ma. The 9.69-8.84 Ma rift transitional volcanic rocks underlying the Santa Rosalia sedimentary basin provide a maximum age on its basal fill. Evaporites in the Santa Rosalia sedimentary basin formed on the margin of the Guaymas basin, where thicker evaporites formed. Overlying coarse-grained clastic sedimentary fill of the Santa Rosalia basin and its stratiform Cu-Co-Zn-Mn sulfides may have accumulated rapidly, coeval with emplacement of 6.06 Ma high-magnesian andesite intrusions and the ca. 6 Ma onset of seafloor spreading in the Guaymas basin.</abstract><pub>Geological Society of America</pub><doi>10.1130/GES02094.1</doi><tpages>30</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1553-040X |
| ispartof | Geosphere (Boulder, Colo.), 2020-08, Vol.16 (4), p.1012-1041 |
| issn | 1553-040X 1553-040X |
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| recordid | cdi_crossref_primary_10_1130_GES02094_1 |
| source | DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | absolute age andesites Ar/Ar Baja California Sur Mexico Cenozoic chemical composition East Pacific Geochronology Guaymas Basin Gulf of California hafnium Hf-177/Hf-176 igneous and metamorphic rocks igneous rocks isotope ratios isotopes lithofacies lithostratigraphy magmatism mapping metals Mexico Miocene Neogene nesosilicates North Pacific Northeast Pacific orthosilicates Pacific Ocean Petrology plate tectonics rare earths rifting Santa Rosalia Mexico silicates spectra stable isotopes Tertiary trachyandesites U/Pb volcanic rocks X-ray fluorescence spectra zircon zircon group |
| title | Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California |
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