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Mineralogy of a High-Temperature Skarn, in High CO2 Activity Conditions: The Occurrence from Măgureaua Vaţei (Metaliferi Massif, Apuseni Mountains, Romania)
Minerals ( IF 2.2 ) Pub Date : 2020-07-30 , DOI: 10.3390/min10080677
Ştefan Marincea , Delia-Georgeta Dumitraş , Cristina Sava , Frédéric Hatert , Fabrice Dal Bo

A shallow-level monzodioritic to quartz-monzodioritic pluton of the Upper Cretaceous age caused contact metamorphism of Tithonic–Kimmeridgian reef limestones at Măgureaua Vaţei (Metaliferi Massif, Apuseni Mountains, Romania). The preserved peak metamorphic assemblage includes gehlenite (Ak 33.64–38.13), monticellite, wollastonite-2M, Ti-poor calcic garnet, and Ca-Tschermak diopside (with up to 11.15 mol.% Ca-Tschermak molecule). From the monzodioritic body to the calcitic marble, the periplutonic zoning can be described as: monzodiorite/agpaitic syenite-like inner endoskarn/wollastonite + perovskite + Ti-poor grossular + Al-rich diopside/wollastonite + Ti-poor grossular + diopside + vesuvianite/gehlenite + wollastonite + Ti poor grossular + Ti-rich grossular (outer endoskarn)/wollastonite + vesuvianite + garnet (inner exoskarn) / wollastonite + Ti-rich garnet + vesuvianite + diopside (outer exoskarn)/calcitic marble. Three generations of Ca garnets could be identified, as follows: (1) Ti-poor grossular (Grs 53.51–81.03 mol.%) in equilibrium with gehlenite; (2) Ti-rich grossular (Grs 51.13–53.47 mol.%, with up to 19.97 mol.% morimotoite in solid solution); and (3) titanian andradite (Grs 32.70–45.85 mol.%), with up to 29.15 mol.% morimotoite in solid solution. An early hydrothermal stage produced retrogression of the peak paragenesis toward vesuvianite, hydroxylellestadite (or Si-substituted apatite), clinochlore, “hibschite” (H4O4-substituted grossular). A late hydrothermal event induced the formation of lizardite, chrysotile, dickite, thaumasite, okenite and tobermorite. A weathering paragenesis includes allophane, C-S-H gels and probably portlandite, unpreserved because of its transformation in aragonite then calcite. Overprints of these late events on the primary zoning are quite limited.

中文翻译:

处于高CO2活性条件下的高温矽卡岩的矿物学:来自MăgureauaVa(ei(罗马尼亚Apuseni山的Metaliferi Massif)的发生

白垩纪上层的浅级单生二叠纪至石英-单生二叠纪岩体引起了MăgureauaVaţei(Metaliferi Massif,罗马尼亚Apuseni山,罗马尼亚)的Tithonic-Kimmeridgian礁岩灰岩的接触变质作用。保留的峰变质组合包括钠铅矿(Ak 33.64–38.13),蒙脱石,硅灰石-2 M,贫钛钙石榴石和Ca-Tschermak透辉石(最多含11.15 mol。%Ca-Tschermak分子)。从Mondidioritic体到钙质大理石,围岩带的区域可描述为:Monzodiorite / agapitic类正长岩内生矽卡岩/硅灰石+钙钛矿+贫钛颗粒+富含Al透辉石/硅灰石+贫Ti颗粒状+透辉石+ vesuvianite /斜晶石+硅灰石+贫钛颗粒+富钛颗粒(外部内矽卡岩)/硅灰石+维苏威石+石榴石(内exoskarn)/硅灰石+富钛石榴石+ vesuvianite +透辉石(外exoskarn)/方解石大理石。可以鉴定出三代钙石榴石,如下:(1)贫钙钛矿(Grs 53.51–81.03 mol。%)与钠钙石平衡;(2)富钛颗粒(固溶体中的Grs为51.13–53.47 mol。%,其中含高达19.97 mol。的绿沸石);(3)钛铁矿和辐射铁矿(Grs 32.70-45.85 mol。%),固溶体中含高达29.15 mol。%的绢云母。早期的热液阶段使共生峰的共生性向着退伍石,羟钙钛矿(或硅取代的磷灰石),斜绿石,“菱铁矿”(H4 O 4-取代的大颗粒)。后期热液事件引起了蜥蜴石,温石棉,地开石,高岭石,钾长石和水辉石的形成。一个风化的共生物包括别铝石,CSH凝胶和可能的波特兰石,由于其在文石中然后在方解石中的转化而未被保存。这些晚期事件在主要分区上的叠印非常有限。
更新日期:2020-07-30
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