塞尔维亚Dinaridic与Vardar西部蛇绿岩变质底变质岩对比:三种不同的压力-温度-时间路径

Danica Srećković-Batoćanin, Nada Vasković, V. Matović, V. Gajić
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引用次数: 3

摘要

比较了塞尔维亚Vardar西部地区Fruska Gora、Povlen (Tejici)、Stolovi和Banjska蛇绿岩和Dinaridic蛇绿岩带Zlatibor、Bistrica、Sjenicki Ozren和Brezovica蛇绿岩下的变质单岩的野外、岩石矿物学、地球化学和年代学资料。重点研究了与洋壳成员接触形成的变质基性岩石:具有E-MORB和oib特征的ssz型累积辉长岩和玄武岩,以及更演化的具有morb亲和性的拉斑玄武岩。角闪洞是由基性单组分形成的主要相,其成分随压力-温度条件的变化而变化。根据矿物组合、估算的P-T条件和年龄,给出了可能的P-T路径:两个域中记录的高压-低温蓝片岩相组合(7-9 kbar, ~400℃和700-850℃),WVZ (Banjska)和DOB (Bistrica, Sjenicki Ozren, Brezovica)和WZV (Tejici, Devovici)和DOB (Zlatibor)识别的中压-中温角闪岩相组合(~3.5-7 kbar, >350-650℃)。峰变质条件指向海洋岩石圈分离的深度及其在10-30 km的初始冷却,但蛇绿岩的年龄和构造背景仍然缺乏约束。总结的资料可作为研究中生代特提斯蛇绿岩地球动力学演化的重要钥匙。[南斯拉夫]塞族共和国部长项目;176019和br。176016]
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Correlation of metabasic rocks from metamorphic soles of the Dinaridic and the Western Vardar zone ophiolites (Serbia): Three contrasting pressure-temperature-time paths
The field, petrological-mineralogical, geochemical and geochronological data of the metamorphic sole rocks recorded beneath the Fruska Gora, Povlen (Tejici), Stolovi and Banjska ophiolites in the Western Vardar Zone (WVZ) and beneath the Zlatibor, Bistrica, Sjenicki Ozren and Brezovica ophiolites in the Dinaridic ophiolite belt (DOB) in Serbia are compared. The focus has been made on metabasic rocks formed in contact with the oceanic crust members: cumulate gabbro and basalts of SSZ-type with E-MORB and OIB-signature and more evolved tholeiitic basalts of MOR-affinity. Amphibole, the major phase formed from the mafic sole components, depending on pressure-temperature conditions exhibits compositional variations. According to mineral assemblages, estimated P-T conditions and ages, the potential P-T paths are given: high pressure - low temperature blueschist facies assemblage (7-9 kbar and ~400°C and <300-350°C and 4-8 kbar), recorded only in the metamorphic sole at the Fruska Gora (WVZ); high pressure - high temperature amphibolite to granulite facies (8-10 kbar and >700-850°C), recorded in both domains, the WVZ (Banjska) and the DOB (Bistrica, Sjenicki Ozren, Brezovica) and medium pressure - medium temperature amphibolite facies assemblages (~3.5-7 kbar and >350-650°C) recognized in the WZV (Tejici, Devovici) and the DOB (Zlatibor). The peak metamorphic conditions point to depths of the oceanic lithosphere detachment and its initial cooling at 10-30 km, but the ages and tectonic setting of ophiolites remain poorly constrained. The summarized data may be used as an important key in geodynamic evolution of the Mesozoic Tethyan ophiolites. [Projekat Ministarstva nauke Republike Srbije, br. 176019 and br. 176016]
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