Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.marpetgeo.2018.07.003 |
Reflux dolomitization - A Holocene example beneath a coastal salina, West Caicos Island, Turks and Caicos Islands | |
Dravis, Jeffrey J.1,2,3; Wanless, Harold R.4 | |
通讯作者 | Dravis, Jeffrey J. |
来源期刊 | MARINE AND PETROLEUM GEOLOGY
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ISSN | 0264-8172 |
EISSN | 1873-4073 |
出版年 | 2018 |
卷号 | 97页码:311-322 |
英文摘要 | Holocene reflux dolomitization occurred beneath the Company Point evaporitic coastal salina on West Caicos Island, less than 1 km in from the edge of Caicos Platform, in the southeastern Bahamas. Poorly ordered, calcian-rich protodolomites replaced coralgal grainstones shed into the salina as storm-washover deposits, and also cemented them. Finer-grained carbonate sands were replaced by fine-crystalline dolomites, but coarser-grained skeletal fragments, including Halimeda sp., dissolved out to create late Holocene, precompactional secondary moldic porosity. Precipitation of overlying evaporitic deposits, principally gypsum, generated magnesium-rich brines. Below these evaporites, the downward increase in the degree of replacement dolomitization, toward the impermeable calcrete that caps Pleistocene grainstones at the base of the Holocene sequence, strongly implies reflux dolomitization. Company Point dolomitization less than 1 km in from the western edge of Caicos Platform demonstrated that this process is not limited to platform- or ramp-interior settings well removed from the open ocean. A semi-arid climate combined with depositional ridge topography and periodic storm surge and groundwater recharge, allowed this coastal salina to initiate and evolve. As these beach-ridge and evaporitic deposits continue to prograde, as they are doing on the eastern side of West Caicos Island, then one can expect associated evaporitic deposits to have the potential not only to serve as an updip sealing facies, but to generate Mg-rich fluids to create precompactional porous dolostones with sheet-like reservoir quality. |
英文关键词 | Carbonates Dolomitization Reflux Holocene Salina Caicos Diagenesis Evaporites |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000449128000022 |
WOS关键词 | CENTRAL ALBERTA ; DOLOMITE ; PLATFORM ; ORIGIN ; AREA ; CONSTRAINTS ; HYDROLOGY ; INDIES ; CANADA ; SABKHA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/211594 |
作者单位 | 1.Dravis Interests Inc, Houston, TX 77005 USA; 2.Dravis Geol Serv, Houston, TX 77005 USA; 3.Rice Univ, Houston, TX 77251 USA; 4.Univ Miami, Geog & Reg Studies, Coll Arts & Sci, Miami, FL USA |
推荐引用方式 GB/T 7714 | Dravis, Jeffrey J.,Wanless, Harold R.. Reflux dolomitization - A Holocene example beneath a coastal salina, West Caicos Island, Turks and Caicos Islands[J],2018,97:311-322. |
APA | Dravis, Jeffrey J.,&Wanless, Harold R..(2018).Reflux dolomitization - A Holocene example beneath a coastal salina, West Caicos Island, Turks and Caicos Islands.MARINE AND PETROLEUM GEOLOGY,97,311-322. |
MLA | Dravis, Jeffrey J.,et al."Reflux dolomitization - A Holocene example beneath a coastal salina, West Caicos Island, Turks and Caicos Islands".MARINE AND PETROLEUM GEOLOGY 97(2018):311-322. |
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