Methane-hydrogen gas seeps, Zambales Ophiolite, Philippines: Deep or shallow origin?
Isotopically anomalous CH 4-rich gas escapes at low flow rate and ambient temperature from seeps in serpentinized ultramafic rock in the Zambales Ophiolite, Philippines. The major components of the gas are CH 4 (55 mole%) and H 2 (42 mole%); the CH 4 CO 2 ratio is > 1800 and the CH 4 He ratio is...
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| Veröffentlicht in: | Chemical geology 1988-12, Vol.71 (1), p.211-222 |
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| creator | Abrajano, T.A. Sturchio, N.C. Bohlke, J.K. Lyon, G.L. Poreda, R.J. Stevens, C.M. |
| description | Isotopically anomalous CH
4-rich gas escapes at low flow rate and ambient temperature from seeps in serpentinized ultramafic rock in the Zambales Ophiolite, Philippines. The major components of the gas are CH
4 (55 mole%) and H
2 (42 mole%); the
CH
4
CO
2
ratio is > 1800 and the
CH
4
He
ratio is 9.2·10
4. The
δ
13C-value of the CH
4 is
−7.0±0.4‰ (PDB),
∼8‰ higher than the highest published values for CH
4 in other natural gases and hot springs, but similar to values commonly attributed to mantle carbon. The
3
He
4
He
ratio is 5.70·10
−6, 4.1 times the atmospheric ratio, indicative of a substantial mantle He component. The δD-values of CH
4 and H
2 are −136 and −590‰, respectively, consistent with equilibration temperatures of 110–125°C. Carbon and He isotopic data could be consistent with derivation of the Zambales gas directly from a reduced mantle. However, phase equilibria and H isotope data indicate that the gas also could have been produced by reduction of water and carbon during low-temperature serpentinization of the ophiolite. |
| doi_str_mv | 10.1016/0009-2541(88)90116-7 |
| format | Article |
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4-rich gas escapes at low flow rate and ambient temperature from seeps in serpentinized ultramafic rock in the Zambales Ophiolite, Philippines. The major components of the gas are CH
4 (55 mole%) and H
2 (42 mole%); the
CH
4
CO
2
ratio is > 1800 and the
CH
4
He
ratio is 9.2·10
4. The
δ
13C-value of the CH
4 is
−7.0±0.4‰ (PDB),
∼8‰ higher than the highest published values for CH
4 in other natural gases and hot springs, but similar to values commonly attributed to mantle carbon. The
3
He
4
He
ratio is 5.70·10
−6, 4.1 times the atmospheric ratio, indicative of a substantial mantle He component. The δD-values of CH
4 and H
2 are −136 and −590‰, respectively, consistent with equilibration temperatures of 110–125°C. Carbon and He isotopic data could be consistent with derivation of the Zambales gas directly from a reduced mantle. However, phase equilibria and H isotope data indicate that the gas also could have been produced by reduction of water and carbon during low-temperature serpentinization of the ophiolite.</description><identifier>ISSN: 0009-2541</identifier><identifier>EISSN: 1872-6836</identifier><identifier>DOI: 10.1016/0009-2541(88)90116-7</identifier><identifier>CODEN: CHGEAD</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Geochemistry ; Hydrocarbons ; Sedimentary rocks ; Soil and rock geochemistry</subject><ispartof>Chemical geology, 1988-12, Vol.71 (1), p.211-222</ispartof><rights>1988</rights><rights>1989 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a387t-624dc0a0d833fe4e515a915bee50becafce312660e14b91bf7d942b7be42d6c43</citedby><cites>FETCH-LOGICAL-a387t-624dc0a0d833fe4e515a915bee50becafce312660e14b91bf7d942b7be42d6c43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0009-2541(88)90116-7$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,780,784,789,790,3550,23930,23931,25140,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=7146013$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Abrajano, T.A.</creatorcontrib><creatorcontrib>Sturchio, N.C.</creatorcontrib><creatorcontrib>Bohlke, J.K.</creatorcontrib><creatorcontrib>Lyon, G.L.</creatorcontrib><creatorcontrib>Poreda, R.J.</creatorcontrib><creatorcontrib>Stevens, C.M.</creatorcontrib><title>Methane-hydrogen gas seeps, Zambales Ophiolite, Philippines: Deep or shallow origin?</title><title>Chemical geology</title><description>Isotopically anomalous CH
4-rich gas escapes at low flow rate and ambient temperature from seeps in serpentinized ultramafic rock in the Zambales Ophiolite, Philippines. The major components of the gas are CH
4 (55 mole%) and H
2 (42 mole%); the
CH
4
CO
2
ratio is > 1800 and the
CH
4
He
ratio is 9.2·10
4. The
δ
13C-value of the CH
4 is
−7.0±0.4‰ (PDB),
∼8‰ higher than the highest published values for CH
4 in other natural gases and hot springs, but similar to values commonly attributed to mantle carbon. The
3
He
4
He
ratio is 5.70·10
−6, 4.1 times the atmospheric ratio, indicative of a substantial mantle He component. The δD-values of CH
4 and H
2 are −136 and −590‰, respectively, consistent with equilibration temperatures of 110–125°C. Carbon and He isotopic data could be consistent with derivation of the Zambales gas directly from a reduced mantle. However, phase equilibria and H isotope data indicate that the gas also could have been produced by reduction of water and carbon during low-temperature serpentinization of the ophiolite.</description><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Geochemistry</subject><subject>Hydrocarbons</subject><subject>Sedimentary rocks</subject><subject>Soil and rock geochemistry</subject><issn>0009-2541</issn><issn>1872-6836</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><recordid>eNp9kE1PwzAMhiMEEmPwDzj0gBBIKyRtmrYcQGh8SkPjMC5cojR116CsLXEH2r8nY2hHTral57Xlh5BjRi8YZeKSUpqHUcLZWZad55QxEaY7ZMCyNApFFotdMtgi--QA8cOPLE6SAZm9QF-rBsJ6Vbp2Dk0wVxggQIej4F0tCmUBg2lXm9aaHkbBa22s6TrTAF4Fd54LWhdgraxtv31r5qa5OSR7lbIIR391SN4e7mfjp3AyfXwe305CFWdpH4qIl5oqWmZxXAGHhCUqZ0kBkNACtKo0xCwSggLjRc6KKi1zHhVpATwqhebxkJxu9nau_VwC9nJhUIO1_qF2iZKl0TouPMg3oHYtooNKds4slFtJRuVaoVz7kWs_Msvkr0KZ-tjJ336FWtnKqUYb3GZTxoXX6LHrDQb-1y8DTqI20GgojQPdy7I1_9_5AXJrhO8</recordid><startdate>19881215</startdate><enddate>19881215</enddate><creator>Abrajano, T.A.</creator><creator>Sturchio, N.C.</creator><creator>Bohlke, J.K.</creator><creator>Lyon, G.L.</creator><creator>Poreda, R.J.</creator><creator>Stevens, C.M.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>19881215</creationdate><title>Methane-hydrogen gas seeps, Zambales Ophiolite, Philippines: Deep or shallow origin?</title><author>Abrajano, T.A. ; Sturchio, N.C. ; Bohlke, J.K. ; Lyon, G.L. ; Poreda, R.J. ; Stevens, C.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a387t-624dc0a0d833fe4e515a915bee50becafce312660e14b91bf7d942b7be42d6c43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Geochemistry</topic><topic>Hydrocarbons</topic><topic>Sedimentary rocks</topic><topic>Soil and rock geochemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abrajano, T.A.</creatorcontrib><creatorcontrib>Sturchio, N.C.</creatorcontrib><creatorcontrib>Bohlke, J.K.</creatorcontrib><creatorcontrib>Lyon, G.L.</creatorcontrib><creatorcontrib>Poreda, R.J.</creatorcontrib><creatorcontrib>Stevens, C.M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</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><jtitle>Chemical geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Abrajano, T.A.</au><au>Sturchio, N.C.</au><au>Bohlke, J.K.</au><au>Lyon, G.L.</au><au>Poreda, R.J.</au><au>Stevens, C.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Methane-hydrogen gas seeps, Zambales Ophiolite, Philippines: Deep or shallow origin?</atitle><jtitle>Chemical geology</jtitle><date>1988-12-15</date><risdate>1988</risdate><volume>71</volume><issue>1</issue><spage>211</spage><epage>222</epage><pages>211-222</pages><issn>0009-2541</issn><eissn>1872-6836</eissn><coden>CHGEAD</coden><abstract>Isotopically anomalous CH
4-rich gas escapes at low flow rate and ambient temperature from seeps in serpentinized ultramafic rock in the Zambales Ophiolite, Philippines. The major components of the gas are CH
4 (55 mole%) and H
2 (42 mole%); the
CH
4
CO
2
ratio is > 1800 and the
CH
4
He
ratio is 9.2·10
4. The
δ
13C-value of the CH
4 is
−7.0±0.4‰ (PDB),
∼8‰ higher than the highest published values for CH
4 in other natural gases and hot springs, but similar to values commonly attributed to mantle carbon. The
3
He
4
He
ratio is 5.70·10
−6, 4.1 times the atmospheric ratio, indicative of a substantial mantle He component. The δD-values of CH
4 and H
2 are −136 and −590‰, respectively, consistent with equilibration temperatures of 110–125°C. Carbon and He isotopic data could be consistent with derivation of the Zambales gas directly from a reduced mantle. However, phase equilibria and H isotope data indicate that the gas also could have been produced by reduction of water and carbon during low-temperature serpentinization of the ophiolite.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0009-2541(88)90116-7</doi><tpages>12</tpages></addata></record> |
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| ispartof | Chemical geology, 1988-12, Vol.71 (1), p.211-222 |
| issn | 0009-2541 1872-6836 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_17226606 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Earth sciences Earth, ocean, space Exact sciences and technology Geochemistry Hydrocarbons Sedimentary rocks Soil and rock geochemistry |
| title | Methane-hydrogen gas seeps, Zambales Ophiolite, Philippines: Deep or shallow origin? |
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