| DOI: | 10.1306/06171312226
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| Scopus记录号: | 2-s2.0-84896855489
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| 论文题名: | A surprising asymmetric paleothermal anomaly around El Gordo diapir, La Popa Basin, Mexico |
| 作者: | Hanson A.D.
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| 刊名: | AAPG Bulletin
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| ISSN: | 0149-1523
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| EISSN: | 1558-9253
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| 出版年: | 2014
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| 发表日期: | 2014
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| 卷: | 98, 期:2 | | 起始页码: | 213
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| 结束页码: | 226
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| 语种: | 英语
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| Scopus关键词: | Circular pattern
; Diagenetics
; Earth's surface
; Eastern side
; Heat history
; High temperature
; Thermal anomalies
; Vitrinite reflectance
; Subsalt strata
; basin
; diapir
; fluid flow
; heat flow
; mudstone
; Tertiary
; uplift
; vitrinite
; vitrinite reflectance
; La Popa Basin
; Mexico [North America]
; Calluna vulgaris
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| Scopus学科分类: | Energy
; Earth and Planetary Sciences
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| 英文摘要: | Thirty-seven mudstone samples were collected from the uppermost Lower Mudstone Member of the Potrerillos Formation in El Gordo minibasin within La Popa Basin, Mexico. The unit is exposed in a circular pattern at the earth's surface and is intersected by El Gordo diapir in the northeast part of the minibasin. Vitrinite reflectance (R0) results show that sampies along the eastern side of the minibasin (i.e., south of the diapir) are mostly thermally immature to low maturity (R0 ranges from 0.53% to 0.64%). Vitrinite values along the southern, western, and northwestern part of the minibasin range between 0.67% and 0.85%. Values of R0 immediately northwest of the diapir are the highest, reaching a maximum of 1.44%. The results are consistent with two different possibilities: (1) that the diapir plunges to the northwest, or (2) that a focused high-temperature heat flow existed along just the northwest margin of the diapir. If the plunging diapir interpretation is correct, then the thermally immature area south of the diapir was in a subsalt position, and the high-maturity area northwest of the diapir was in a suprasalt position prior to Tertiary uplift and erosion. If a presumed salt source at depth to the northwest of El Gordo also fed El Papalote diapir, which is located just to the north of El Gordo diapir, then the tabular halokinetic sequences that are found only along the east side of El Papalote may be subsalt features. However, if the diapir is subvertical and the high-maturity values northwest of the diapir are caused by prolonged, high-temperature fluid flow along just the northwestern margin of the diapir, then both of these scenarios are in disagreement with previously published numerical models. This disagreement arises because the models predict that thermal anomalies will extend outward from a diapir a distance roughly 1.5 times the radius of the diapir, but the results reported here show that the anomalous values on one side of the diapir are about two times the radius, whereas they are as much as five times the radius on the other side of the diapir. The resuits indicate that strata adjacent to salt margins may experience significantly different heat histories adjacent to different margins of diapirs that result in strikingly different diagenetic histories, even at the same depth. ©2014. The American Association of Petroleum Geologists. All rights reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896855489&doi=10.1306%2f06171312226&partnerID=40&md5=7956bc4f0d2c778ad28727988986c47c
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/13094
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| Recommended Citation: | |
Hanson A.D.. A surprising asymmetric paleothermal anomaly around El Gordo diapir, La Popa Basin, Mexico[J]. AAPG Bulletin,2014-01-01,98(2)
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