globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.015
论文题名:
Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia
作者: Read J.F.; Husinec A.; Cangialosi M.; Loehn C.W.; Prtoljan B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449
起始页码: 108
结束页码: 126
语种: 英语
英文关键词: Geochemistry ; Isolated platform ; Mesohaline reflux ; Post-depositional dolomite ; Stabilization
英文摘要: The Jurassic-Cretaceous dolomites, Adriatic platform, Croatia resulted from climate-influenced post-depositional reflux dolomitization (as opposed to synsedimentary peritidal- and deeper burial dolomitization), and subsequent stabilization within a Mesozoic, "calcite sea" isolated platform. The dolomites are stratiform (10 to 200 m thick), fabric destructive (20 to over 500 μm crystals), nonluminescent, and zoned with respect to Ca. Bulk dolomites have low Mn (10 to 30 ppm), moderate Sr (60 to over 200 ppm), positive δ13C and δ18O values, only moderate ordering (0.25 to 0.6) and single-phase fluid inclusions (temperatures <50 °C). High-Ca dolomite (HCD; ~53 to ~59 mol% Ca; δ18O + 1 to > + 3‰ VPDB and Sr > 100 ppm) composes most Jurassic and 40% of Cretaceous dolomites, making up turbid dolomite cores and initial clear dolomite rims. A first generation of low-Ca dolomite (LCD-1; 50 to 53 mol% Ca; δ18O + 1 to > + 3‰ VPDB; 100-180 ppm Sr) forms cement and variably replaces (stabilizes) earlier HCD cores. HCD and LCD-1 formed in refluxing marine-dominated pore waters under semi-arid climate (<300 m depth, 30 to ~40 °C). 87/86Sr values of the HCD and LCD-1 dominantly were controlled by the refluxing seawater 87/86Sr with minor addition of 87/86Sr from ascending cooling fluids. During maturation of HCD, Sr loss was greatest from least stable, more calcic HCD (>55 mol%) phases. A second generation of much younger, low-Ca dolomite (LCD-2; fracture-associated, more negative δ18O from -1.4 to +1‰ VPDB, Sr <100 ppm, enriched in radiogenic 87Sr) overgrows and variably replaces earlier Cretaceous dolomites. It formed during Eocene-Oligocene deformation and uplift to <1 km burial depths (<50 °C) from synorogenic, mixed marine-meteoric pore fluids, circulating via faults, fractures and local permeable zones. Porosity loss by dolomite cementation coupled with localized, rapid Cenozoic uplift, variably arrested stabilization to LCD. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68487
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geosciences, Virginia Tech BlacksburgVA, United States; Department of Geology, St. Lawrence University, Canton, NY, United States; Department of Geosciences, Virginia Tech, Presently University of Arizona, 1040 E. 4th St., Tucson, AZ, United States; Department of Geology, Croatian Geological Survey, Sachsova 2, Zagreb, Croatia

Recommended Citation:
Read J.F.,Husinec A.,Cangialosi M.,et al. Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449
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