Arid
DOI10.1016/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
ISSN0264-8172
EISSN1873-4073
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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