High temperature metamorphism in the conductive boundary layer adjacent to a rhyolite intrusion in the Krafla geothermal system, Iceland
▶ We studied drill cuttings of granoblastic hornfelses recovered adjacent to the intrusive contact in IDDP-1. ▶ Two pyroxene geothermometry records temperatures in the range of 800–950°C. ▶ The heat flow across the conductive boundary layer is calculated to be a minimum of 23Wm−2. A rhyolite magma b...
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| Veröffentlicht in: | Geothermics 2014-01, Vol.49, p.42-48 |
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| creator | Schiffman, Peter Zierenberg, Robert A. Mortensen, Anette K. Friðleifsson, Guðmundur Ó. Elders, Wilfred A. |
| description | ▶ We studied drill cuttings of granoblastic hornfelses recovered adjacent to the intrusive contact in IDDP-1. ▶ Two pyroxene geothermometry records temperatures in the range of 800–950°C. ▶ The heat flow across the conductive boundary layer is calculated to be a minimum of 23Wm−2.
A rhyolite magma body within the Krafla geothermal system that was encountered at a depth of 2.1km during drilling of the IDDP-1 borehole is producing high temperature metamorphism within a conductive boundary layer (CBL) in adjacent host rocks. Cuttings recovered during drilling within a few meters of the intrusive contact in IDDP-1 are mainly comprised of granoblastic hornfelses, the rock type which confirms the presence of the CBL at the base of the IDDP-1 bore hole. The two pyroxenes in these hornfelses record temperatures that are in the range of 800–950°C. The minimum heat flow across the CBL is 23Wm−2. Country rocks at distances beyond 30m of the intrusive contact are essentially unaltered, implying that they have been emplaced very recently and/or as yet unaffected by hydrothermal fluid flow. |
| doi_str_mv | 10.1016/j.geothermics.2012.11.002 |
| format | Article |
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A rhyolite magma body within the Krafla geothermal system that was encountered at a depth of 2.1km during drilling of the IDDP-1 borehole is producing high temperature metamorphism within a conductive boundary layer (CBL) in adjacent host rocks. Cuttings recovered during drilling within a few meters of the intrusive contact in IDDP-1 are mainly comprised of granoblastic hornfelses, the rock type which confirms the presence of the CBL at the base of the IDDP-1 bore hole. The two pyroxenes in these hornfelses record temperatures that are in the range of 800–950°C. The minimum heat flow across the CBL is 23Wm−2. Country rocks at distances beyond 30m of the intrusive contact are essentially unaltered, implying that they have been emplaced very recently and/or as yet unaffected by hydrothermal fluid flow.</description><identifier>ISSN: 0375-6505</identifier><identifier>EISSN: 1879-3576</identifier><identifier>DOI: 10.1016/j.geothermics.2012.11.002</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Boreholes ; Boundary layer ; Contact ; Contact metamorphism ; Drilling ; Geothermal ; IDDP-1 ; Krafla ; Meters ; Rhyolite ; Rocks</subject><ispartof>Geothermics, 2014-01, Vol.49, p.42-48</ispartof><rights>2012 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a527t-9623e853a5ec24aade9034b3baf1634cab923cfa750d5ddd1b485e7cef8d3d653</citedby><cites>FETCH-LOGICAL-a527t-9623e853a5ec24aade9034b3baf1634cab923cfa750d5ddd1b485e7cef8d3d653</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.geothermics.2012.11.002$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,782,786,3554,27933,27934,46004</link.rule.ids></links><search><creatorcontrib>Schiffman, Peter</creatorcontrib><creatorcontrib>Zierenberg, Robert A.</creatorcontrib><creatorcontrib>Mortensen, Anette K.</creatorcontrib><creatorcontrib>Friðleifsson, Guðmundur Ó.</creatorcontrib><creatorcontrib>Elders, Wilfred A.</creatorcontrib><title>High temperature metamorphism in the conductive boundary layer adjacent to a rhyolite intrusion in the Krafla geothermal system, Iceland</title><title>Geothermics</title><description>▶ We studied drill cuttings of granoblastic hornfelses recovered adjacent to the intrusive contact in IDDP-1. ▶ Two pyroxene geothermometry records temperatures in the range of 800–950°C. ▶ The heat flow across the conductive boundary layer is calculated to be a minimum of 23Wm−2.
A rhyolite magma body within the Krafla geothermal system that was encountered at a depth of 2.1km during drilling of the IDDP-1 borehole is producing high temperature metamorphism within a conductive boundary layer (CBL) in adjacent host rocks. Cuttings recovered during drilling within a few meters of the intrusive contact in IDDP-1 are mainly comprised of granoblastic hornfelses, the rock type which confirms the presence of the CBL at the base of the IDDP-1 bore hole. The two pyroxenes in these hornfelses record temperatures that are in the range of 800–950°C. The minimum heat flow across the CBL is 23Wm−2. Country rocks at distances beyond 30m of the intrusive contact are essentially unaltered, implying that they have been emplaced very recently and/or as yet unaffected by hydrothermal fluid flow.</description><subject>Boreholes</subject><subject>Boundary layer</subject><subject>Contact</subject><subject>Contact metamorphism</subject><subject>Drilling</subject><subject>Geothermal</subject><subject>IDDP-1</subject><subject>Krafla</subject><subject>Meters</subject><subject>Rhyolite</subject><subject>Rocks</subject><issn>0375-6505</issn><issn>1879-3576</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqNkb1u3DAQhInAAXJ28g5Ml8KS-SOKUhkcHJ9hA2mSmliRKx8PknghKQP3Bnls07gYSOlqm5lvZ3cI-cpZzRlvbw71E4a8xzh7m2rBuKg5rxkTH8iGd7qvpNLtBdkwqVXVKqY-kcuUDowxrTTbkL87_7SnGecjRshrRDpjhjnE496nmfqFFji1YXGrzf4Z6RDWxUE80QlOGCm4A1hcMs2BAo37U5h8xuLLcU0-LG-EhwjjBPQtLEw0nVJZe03vLU6wuM_k4whTwi__5hX5_eP213ZXPf68u99-f6xACZ2rvhUSOyVBoRUNgMOeyWaQA4y8lY2FoRfSjqAVc8o5x4emU6gtjp2TrlXyinw7c48x_FkxZTP7VCKUDBjWZHjbCNE1zXukirWy07zri7Q_S20MKUUczTH6ubzJcGZeizIH819R5rUow7kpRRXv9uzFcvazx2iS9bhYdD6izcYF_w7KC6pupiI</recordid><startdate>201401</startdate><enddate>201401</enddate><creator>Schiffman, Peter</creator><creator>Zierenberg, Robert A.</creator><creator>Mortensen, Anette K.</creator><creator>Friðleifsson, Guðmundur Ó.</creator><creator>Elders, Wilfred A.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>201401</creationdate><title>High temperature metamorphism in the conductive boundary layer adjacent to a rhyolite intrusion in the Krafla geothermal system, Iceland</title><author>Schiffman, Peter ; Zierenberg, Robert A. ; Mortensen, Anette K. ; Friðleifsson, Guðmundur Ó. ; Elders, Wilfred A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a527t-9623e853a5ec24aade9034b3baf1634cab923cfa750d5ddd1b485e7cef8d3d653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Boreholes</topic><topic>Boundary layer</topic><topic>Contact</topic><topic>Contact metamorphism</topic><topic>Drilling</topic><topic>Geothermal</topic><topic>IDDP-1</topic><topic>Krafla</topic><topic>Meters</topic><topic>Rhyolite</topic><topic>Rocks</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schiffman, Peter</creatorcontrib><creatorcontrib>Zierenberg, Robert A.</creatorcontrib><creatorcontrib>Mortensen, Anette K.</creatorcontrib><creatorcontrib>Friðleifsson, Guðmundur Ó.</creatorcontrib><creatorcontrib>Elders, Wilfred A.</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Geothermics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schiffman, Peter</au><au>Zierenberg, Robert A.</au><au>Mortensen, Anette K.</au><au>Friðleifsson, Guðmundur Ó.</au><au>Elders, Wilfred A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High temperature metamorphism in the conductive boundary layer adjacent to a rhyolite intrusion in the Krafla geothermal system, Iceland</atitle><jtitle>Geothermics</jtitle><date>2014-01</date><risdate>2014</risdate><volume>49</volume><spage>42</spage><epage>48</epage><pages>42-48</pages><issn>0375-6505</issn><eissn>1879-3576</eissn><abstract>▶ We studied drill cuttings of granoblastic hornfelses recovered adjacent to the intrusive contact in IDDP-1. ▶ Two pyroxene geothermometry records temperatures in the range of 800–950°C. ▶ The heat flow across the conductive boundary layer is calculated to be a minimum of 23Wm−2.
A rhyolite magma body within the Krafla geothermal system that was encountered at a depth of 2.1km during drilling of the IDDP-1 borehole is producing high temperature metamorphism within a conductive boundary layer (CBL) in adjacent host rocks. Cuttings recovered during drilling within a few meters of the intrusive contact in IDDP-1 are mainly comprised of granoblastic hornfelses, the rock type which confirms the presence of the CBL at the base of the IDDP-1 bore hole. The two pyroxenes in these hornfelses record temperatures that are in the range of 800–950°C. The minimum heat flow across the CBL is 23Wm−2. Country rocks at distances beyond 30m of the intrusive contact are essentially unaltered, implying that they have been emplaced very recently and/or as yet unaffected by hydrothermal fluid flow.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.geothermics.2012.11.002</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Boreholes Boundary layer Contact Contact metamorphism Drilling Geothermal IDDP-1 Krafla Meters Rhyolite Rocks |
| title | High temperature metamorphism in the conductive boundary layer adjacent to a rhyolite intrusion in the Krafla geothermal system, Iceland |
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