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The Lower to Middle Miocene Cayman Formation on Grand Cayman, which is part of the Bluff Group, is at least 130 m thick. The mostly dolomitized Cayman Formation is herein divided into a ‘limestone member’ and ‘dolostone member’ as limestone is found in the formation in the central part of Grand...
Diagenetic overprint on negative <delta>13C excursions across the Permian/Triassic boundary: A case study from Meishan section, China.Download
The Meishan Section D from China is the global stratotype section and point (GSSP) of the Permian-Triassic boundary (PTB). The succession has been divided into 115 beds with the PTB being placed in the middle of Bed 27. In this section and the laterally equivalent Section A, the diagenetic...
The lacustrine Green River Formation (GRF) is an important oil-producing formation in the Uinta Basin, Utah (USA). In recent years, the unconventional carbonate reservoirs in the Uteland Butte member (UBM), base of the GRF, have been targeted because their estimated oil and gas resources. The...
Cenozoic ‘island dolostones’ are found on islands throughout the oceans of the world. Due to their geological youth and lack of deep burial, these dolostones provide an opportunity to resolve some of the mysteries surrounding the dolomite problem. In island dolostone bodies, which are of variable...
Origin of Island Dolostone: Case Study of Cayman Formation (Miocene), Grand Cayman, British West IndiesDownload
Grand Cayman is located on an isolated fault block that is part of the Cayman Ridge that defines the southern margin of the North American Plate. The exposed part of the Oligocene to Pleistocene carbonate succession that forms the island comprises the Bluff Group (Brac Formation, Cayman...
Origin of island dolostones: case study based on Tertiary dolostones from Cayman Brac, British West IndiesDownload
Cayman Brac (19 km long, 1.5 to 3 km wide), which is the easternmost of the Cayman Islands, is characterized by a thick Tertiary carbonate succession that has been pervasively dolomitized. The finely crystalline dolostones in the Cayman Formation (Miocene) are fabric-retentive whereas the...
Sedimentology, diagenesis, and dolomitization of the Brac Formation (Lower Oligocene), Cayman Brac, British West IndiesDownload
The Oligocene Brac Formation is the oldest part of the Bluff Group that is exposed on Cayman Brac. Sediments of the Brac Formation were deposited on a small, open bank in shallow marine waters. Today, the formation is composed of limestone, finely crystalline dolostone, and coarsely crystalline...
Spatial variations in the stoichiometry and geochemistry of Miocene dolomite from Grand Cayman: Implications for the origin of island dolostone.Download
The Cayman Formation (Miocene), ~ 140 m thick on Grand Cayman, is incompletely dolomitized with the most of the dolomite restricted to the peripheral part of the island. These calcium-rich dolomites, with 50–60 mol%CaCO3 (%Ca), are divided into low-calcium dolomite (LCD, %Ca < 55%) and...