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Quaternary carbonate and evaporite sedimentary facies and their ancient analogues
eBook Publisher: John Wiley & Sons
Imprint: Wiley-Blackwell
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This volume commemorates the eclectic research of Douglas James Shearman into evaporites, which was initiated by his studies of the prograding UAE coastal sabkhas or salt flats that incorporate evaporite minerals which displace and replace earlier carbonate sediments. His subsequent proselytization of the study of ancient evaporites in sedimentary sections all over the world led to fundamental advances in our understanding of arid zone carbonate sedimentology. The papers presented here are based on presentations made in Abu Dhabi, UAE 12-14th October 2004 and 7th –8th November 2006. They provide a retrospective from the 1960's and 70's of Holocene evaporites and carbonates, recapturing Shearman's contribution by revisiting the Holocene coastal evaporite and carbonate sediments of the Arabian/Persian Gulf from Abu Dhabi, Qatar, and Oman. The first set of papers considers these sediments from the perspective of their coastal geomorphology, sedimentary character and their geochemistry. Later papers examine the significance of these settings in the ancient geological section world-wide, including examples from the Mesozoic-Cenozoic of the Moroccan Atlantic margin and the Upper Jurassic Arab Formation of the Arabian Gulf.
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| Title of eBook: Quaternary carbonate and evaporite sedimentary facies and their ancient analogues | |
| Release Date: 02-18-2011 | |
| Publisher: Wiley-Blackwell |
This eBook download is available in the following formats:
| Parent title | Quaternary carbonate and evaporite... |
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Quaternary carbonate and evaporite sedimentary facies and their ancient analogues
Chapter One
Introduction to Quaternary carbonate and evaporite sedimentary facies and their ancient analoguesABDULRAHMAN S. ALSHARHAN and CHRISTOPHER G. St. C. Kendall
ABSTRACT
Douglas James Shearman (1918–2003) used his imagination to extend our understanding of the sabkha evaporites of the Arabian Gulf, and their use as analogues for evaporites that are now associated worldwide with hydrocarbon exploration and exploitation. His work on the Holocene carbonates and evaporites of the southern coast of the Arabian Gulf has meant that these are now the most frequently cited examples of type-analogues for assemblages of shallow-water carbonates, evaporites and siliciclastics found throughout the geological record. Striking examples from the United Arab Emirates (UAE) and nearby regions include those found in the Tertiary and Mesozoic sedimentary rocks ofthe immediate subsurface. Other analogues of this setting include the Palaeozoic carbonates of the western USA, Europe and Asia, and the Mesozoic carbonates of the Gulf of Mexico and Europe.
INTRODUCTION
The Arabic word for salt flat, "sabkha", was coined by Shearman in the field in 1961 to differentiate the facies he first saw exposed on the then Trucial Coast (now the United Arab Emirates, UAE). Since then, the word sabkha has been incorporated into the evaporite literature to describe both continental and near-coastal evaporative sediments that accumulate close to the sedimentary surface. The subaerial boundary of this flat is a geomorphic surface whose level is dictated by, and is in equilibrium with, the local water table. Sabkhas are occasionally c
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