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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia
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Climate controlled, fabric destructive, reflux dolomitization and stabilization via marine- and synorogenic mixed fluids: An example from a large Mesozoic, calcite-sea platform, Croatia

机译：通过海洋和协同作用的混合流体进行气候控制，织物破坏，回流白云石化和稳定化：以克罗地亚一个大型中生代方解石-海平台为例

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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 mu m 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 delta C-13 and delta O-18 values, only moderate ordering (0.25 to 0.6) and single-phase fluid inclusions (temperatures <50 degrees C). High-Ca dolomite (HCD; similar to 53 to similar to 59 mol% Ca; delta O-18 + 1 to > + 3 parts per thousand 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; delta O-18 + 1 to > + 3 parts per thousand. 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 similar to 40 degrees C). Sr-87/86 values of the HCD and LCD-1 dominantly were controlled by the refluxing seawater Sr-87/86 with minor addition of Sr-87/86 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 delta O-18 from -1.4 to +1 parts per thousand. VPDB, Sr <100 ppm, enriched in radiogenic Sr-87) overgrows and variably replaces earlier Cretaceous dolomites. It formed during Eocene-Oligocene deformation and uplift to <1 km burial depths (<50 degrees 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. (C) 2016 Elsevier B.V. All rights reserved.
机译：克罗地亚的侏罗纪-白垩纪白云岩是受气候影响的沉积后回流白云石化作用的结果（与同沉积期和深埋的白云石化作用相反），以及随后在中生代“方解石海”孤立的平台内的稳定作用。白云石为层状（10至200 m厚），破坏性的织物（20至500微米以上的晶体），不发光，并相对于Ca进行了分区。大块白云岩的Mn（10至30 ppm）低，Sr（60至200 ppm以上），δC-13和δO-18为正值，仅适度有序（0.25至0.6）和单相流体包裹体（温度） <50摄氏度）。高钙白云岩（HCD;类似于53至类似的59摩尔％Ca;δO-18 + 1至> + 3千分之几VPDB，Sr> 100 ppm）构成了侏罗纪和40％的白垩纪白云岩，构成了浑浊的白云岩岩心和初始透明的白云岩边缘。第一代低钙白云石（LCD-1; 50至53 mol％Ca;δO-18 + 1至> + 3千分之几。VPDB; 100-180 ppm Sr）形成水泥并可变地替代（稳定化）早期的HCD内核。 HCD和LCD-1在半干旱气候（深度小于300 m，30至接近40摄氏度）下在回流的以海洋为主的孔隙水中形成。 HCD和LCD-1的Sr-87 / 86值主要由回流的海水Sr-87 / 86和从上升的冷却液中少量添加的Sr-87 / 86来控制。在HCD的成熟过程中，Sr的损失从最不稳定的钙化HCD（> 55 mol％）相开始最大。第二代年轻得多的低钙白云石（LCD-2;与断裂相关的负负δO-18，从-1.4到千分之+1。VPDB，Sr <100 ppm，富含放射源Sr-87）过度生长，并不同程度地替代了早白垩纪的白云岩。它是在始新世-渐新世的变形过程中形成的，并由同生，混合的海-陆孔隙流体从断层，裂缝和局部渗透带中循环升至<1 km的埋藏深度（<50摄氏度）。白云石胶结作用造成的孔隙度损失，加上新生代的局部快速隆升，对LCD的稳定作用各有不同。 （C）2016 Elsevier B.V.保留所有权利。

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