Interplay of deformation and magmatism in the Pangong Transpression Zone, eastern Ladakh, India: Implications for remobilization of the trans-Himalayan magmatic arc and initiation of the Karakoram Fault
In the eastern part of Ladakh, the right-lateral Karakoram Fault Zone (KFZ) bifurcates into two strands called the Pangong Strand and the Tangtse Strand. These two strands bound a region called the Pangong Transpression Zone (PTZ), which consists of migmatitic dioritic gneiss, calc-silicates and the...
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description | In the eastern part of Ladakh, the right-lateral Karakoram Fault Zone (KFZ) bifurcates into two strands called the Pangong Strand and the Tangtse Strand. These two strands bound a region called the Pangong Transpression Zone (PTZ), which consists of migmatitic dioritic gneiss, calc-silicates and the Durbuk Pluton; a pluton of two-mica leucogranite. Outcrop scale observations suggest pervasive migration of leucogranitic melt through the existing tectonic structures of the gneiss. Magnetic fabric from both the tectonized and undeformed parts of the Durbuk Pluton show parallelism with the tectonic fabric of the host gneiss, which, along with pervasive melt migration, indicates syn-kinematic relationship between deformation along the KFZ, leucogranite magmatism and emplacement of the Durbuk Pluton. U–Pb geochronology of zircons from the dioritic gneiss yields a crystallization age of 63.6 ± 1.5 Ma and also shows younger zircon growth down to ∼13 Ma, which suggest arc magmatism at ∼65 Ma followed by partial melting and leucogranite magmatism in the KFZ till ∼13 Ma. One two-mica leucogranite sample from the Durbuk Pluton gives a crystallization age of 22.7 ± 0.5 Ma. As the Durbuk Pluton is syn-tectonic with deformation along KFZ, it is inferred that the KFZ initiated at least ∼23 Ma ago.
•Syn-deformation melt migration and pluton emplacement documented from the Karakoram Fault Zone.•Deformation caused remobilization and metamorphic resetting of a pre-existing magmatic arc.•Geochronology shows deformation and magmatism in Karakoram Fault Zone till ∼13 Ma.•Age of syn-tectonic pluton suggests initiation of Karakoram shear system at least 23 Ma ago.•Post-solidus deformation continued even after cessation of leucogranite magmatism. |
doi_str_mv | 10.1016/j.jsg.2014.01.009 |
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•Syn-deformation melt migration and pluton emplacement documented from the Karakoram Fault Zone.•Deformation caused remobilization and metamorphic resetting of a pre-existing magmatic arc.•Geochronology shows deformation and magmatism in Karakoram Fault Zone till ∼13 Ma.•Age of syn-tectonic pluton suggests initiation of Karakoram shear system at least 23 Ma ago.•Post-solidus deformation continued even after cessation of leucogranite magmatism.</description><identifier>ISSN: 0191-8141</identifier><identifier>EISSN: 1873-1201</identifier><identifier>DOI: 10.1016/j.jsg.2014.01.009</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Age ; Anisotropy of magnetic susceptibility ; Crystallization ; Deformation ; Fabrics ; Gneiss ; Granite ; Karakoram ; Melts ; Strands ; Tectonics ; Transpression ; U–Pb geochronology ; Zircon</subject><ispartof>Journal of structural geology, 2014-05, Vol.62, p.13-24</ispartof><rights>2014 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a353t-1f0d4463adb6782f8cc60255d2e13e1b5dfcab7df8b2f6a84baed30268aecae93</citedby><cites>FETCH-LOGICAL-a353t-1f0d4463adb6782f8cc60255d2e13e1b5dfcab7df8b2f6a84baed30268aecae93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jsg.2014.01.009$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Sen, Koushik</creatorcontrib><creatorcontrib>Mukherjee, Barun K.</creatorcontrib><creatorcontrib>Collins, Alan S.</creatorcontrib><title>Interplay of deformation and magmatism in the Pangong Transpression Zone, eastern Ladakh, India: Implications for remobilization of the trans-Himalayan magmatic arc and initiation of the Karakoram Fault</title><title>Journal of structural geology</title><description>In the eastern part of Ladakh, the right-lateral Karakoram Fault Zone (KFZ) bifurcates into two strands called the Pangong Strand and the Tangtse Strand. These two strands bound a region called the Pangong Transpression Zone (PTZ), which consists of migmatitic dioritic gneiss, calc-silicates and the Durbuk Pluton; a pluton of two-mica leucogranite. Outcrop scale observations suggest pervasive migration of leucogranitic melt through the existing tectonic structures of the gneiss. Magnetic fabric from both the tectonized and undeformed parts of the Durbuk Pluton show parallelism with the tectonic fabric of the host gneiss, which, along with pervasive melt migration, indicates syn-kinematic relationship between deformation along the KFZ, leucogranite magmatism and emplacement of the Durbuk Pluton. U–Pb geochronology of zircons from the dioritic gneiss yields a crystallization age of 63.6 ± 1.5 Ma and also shows younger zircon growth down to ∼13 Ma, which suggest arc magmatism at ∼65 Ma followed by partial melting and leucogranite magmatism in the KFZ till ∼13 Ma. One two-mica leucogranite sample from the Durbuk Pluton gives a crystallization age of 22.7 ± 0.5 Ma. As the Durbuk Pluton is syn-tectonic with deformation along KFZ, it is inferred that the KFZ initiated at least ∼23 Ma ago.
•Syn-deformation melt migration and pluton emplacement documented from the Karakoram Fault Zone.•Deformation caused remobilization and metamorphic resetting of a pre-existing magmatic arc.•Geochronology shows deformation and magmatism in Karakoram Fault Zone till ∼13 Ma.•Age of syn-tectonic pluton suggests initiation of Karakoram shear system at least 23 Ma ago.•Post-solidus deformation continued even after cessation of leucogranite magmatism.</description><subject>Age</subject><subject>Anisotropy of magnetic susceptibility</subject><subject>Crystallization</subject><subject>Deformation</subject><subject>Fabrics</subject><subject>Gneiss</subject><subject>Granite</subject><subject>Karakoram</subject><subject>Melts</subject><subject>Strands</subject><subject>Tectonics</subject><subject>Transpression</subject><subject>U–Pb geochronology</subject><subject>Zircon</subject><issn>0191-8141</issn><issn>1873-1201</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9kUFv1DAQhS0EEkvhB3DzkUMTPHGSzcIJVS1ddSU4lAsXa2JPtt4mdrC9SOUn8qtwuuXAhZM11nvfm9Fj7C2IEgS07w_lIe7LSkBdCiiF2DxjK-jWsoD895ytBGyg6KCGl-xVjAeRPQ3UK_Z76xKFecQH7gduaPBhwmS94-gMn3C_THHi1vF0R_wrur13e34b0MU5UIyL9Lt3dM4JY0Y5vkOD93fnfOuMxQ98O82j1Y_MyDOeB5p8b0f765STYxdyWojFtZ0w74Lub7TmGPTjLtbZZP-x3GDAex9w4ld4HNNr9mLAMdKbp_eMfbu6vL24LnZfPm8vPu0KlI1MBQzC1HUr0fTtuquGTutWVE1jKgJJ0Ddm0NivzdD11dBiV_dIRoqq7ZA00kaesXcn7hz8jyPFpCYbNY0jOvLHqKCRIKSsNzJL4STVwccYaFBzyBeGBwVCLb2pg8q9qaU3JUDl3rLn48lD-YafloKK2pLTZGwgnZTx9j_uP9lapjo</recordid><startdate>201405</startdate><enddate>201405</enddate><creator>Sen, Koushik</creator><creator>Mukherjee, Barun K.</creator><creator>Collins, Alan S.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SM</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>201405</creationdate><title>Interplay of deformation and magmatism in the Pangong Transpression Zone, eastern Ladakh, India: Implications for remobilization of the trans-Himalayan magmatic arc and initiation of the Karakoram Fault</title><author>Sen, Koushik ; Mukherjee, Barun K. ; Collins, Alan S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a353t-1f0d4463adb6782f8cc60255d2e13e1b5dfcab7df8b2f6a84baed30268aecae93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Age</topic><topic>Anisotropy of magnetic susceptibility</topic><topic>Crystallization</topic><topic>Deformation</topic><topic>Fabrics</topic><topic>Gneiss</topic><topic>Granite</topic><topic>Karakoram</topic><topic>Melts</topic><topic>Strands</topic><topic>Tectonics</topic><topic>Transpression</topic><topic>U–Pb geochronology</topic><topic>Zircon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sen, Koushik</creatorcontrib><creatorcontrib>Mukherjee, Barun K.</creatorcontrib><creatorcontrib>Collins, Alan S.</creatorcontrib><collection>CrossRef</collection><collection>Earthquake Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of structural geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sen, Koushik</au><au>Mukherjee, Barun K.</au><au>Collins, Alan S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Interplay of deformation and magmatism in the Pangong Transpression Zone, eastern Ladakh, India: Implications for remobilization of the trans-Himalayan magmatic arc and initiation of the Karakoram Fault</atitle><jtitle>Journal of structural geology</jtitle><date>2014-05</date><risdate>2014</risdate><volume>62</volume><spage>13</spage><epage>24</epage><pages>13-24</pages><issn>0191-8141</issn><eissn>1873-1201</eissn><abstract>In the eastern part of Ladakh, the right-lateral Karakoram Fault Zone (KFZ) bifurcates into two strands called the Pangong Strand and the Tangtse Strand. These two strands bound a region called the Pangong Transpression Zone (PTZ), which consists of migmatitic dioritic gneiss, calc-silicates and the Durbuk Pluton; a pluton of two-mica leucogranite. Outcrop scale observations suggest pervasive migration of leucogranitic melt through the existing tectonic structures of the gneiss. Magnetic fabric from both the tectonized and undeformed parts of the Durbuk Pluton show parallelism with the tectonic fabric of the host gneiss, which, along with pervasive melt migration, indicates syn-kinematic relationship between deformation along the KFZ, leucogranite magmatism and emplacement of the Durbuk Pluton. U–Pb geochronology of zircons from the dioritic gneiss yields a crystallization age of 63.6 ± 1.5 Ma and also shows younger zircon growth down to ∼13 Ma, which suggest arc magmatism at ∼65 Ma followed by partial melting and leucogranite magmatism in the KFZ till ∼13 Ma. One two-mica leucogranite sample from the Durbuk Pluton gives a crystallization age of 22.7 ± 0.5 Ma. As the Durbuk Pluton is syn-tectonic with deformation along KFZ, it is inferred that the KFZ initiated at least ∼23 Ma ago.
•Syn-deformation melt migration and pluton emplacement documented from the Karakoram Fault Zone.•Deformation caused remobilization and metamorphic resetting of a pre-existing magmatic arc.•Geochronology shows deformation and magmatism in Karakoram Fault Zone till ∼13 Ma.•Age of syn-tectonic pluton suggests initiation of Karakoram shear system at least 23 Ma ago.•Post-solidus deformation continued even after cessation of leucogranite magmatism.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jsg.2014.01.009</doi><tpages>12</tpages></addata></record> |
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subjects | Age Anisotropy of magnetic susceptibility Crystallization Deformation Fabrics Gneiss Granite Karakoram Melts Strands Tectonics Transpression U–Pb geochronology Zircon |
title | Interplay of deformation and magmatism in the Pangong Transpression Zone, eastern Ladakh, India: Implications for remobilization of the trans-Himalayan magmatic arc and initiation of the Karakoram Fault |
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