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Tectono-thermal evolution of ultrahigh-temperature- (UHT-) metamorphic rocks in the Madurai Block of the Southern Granulite Terrane (southern India)

南部麻粒岩地体马杜赖地块超高温（UHT）变质岩的构造热演化（印度南部）

基本信息

批准号：
220402090
负责人：
Professor Dr. Hartwig E. Frimmel
金额：
--
依托单位：
Institut für Angewandte Geowissenschaften (AGW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/220402090?language=en
关键词：
Tectono thermal evolution ultrahigh temperature

项目摘要

The metamorphic rocks of the Southern Indian Shield are considered as the best archive for geodynamic processes and serve as a valuable tool for the reconstruction of Precambrian crustal evolution in the Indian sub-continent. The Madurai Block constitutes part of the Southern Granulite Terrane in southern India and is made up of a variety of rock types, including mafic granulite, charnockite, sapphirine-bearing granulite, calc-granulite, quarzite, leptynite, gneisses, migmatite, etc. Of particular significance are sapphirine/kornerupine-bearing granulites because they preserve signatures of metamorphic crystallization along the prograde path through arrested textures and are thus potential tools for the derivation of the P-T trajectory of metamorphism. To date, the nature and cause of ultrahigh-temperature- (UHT-) metamorphism in the Madurai Block remain unresolved, with conflicting models of P-T paths presented in the literature. Detailed textural and petrological analyses of arrested reaction textures are planned, in combination with the modeling of pseudosections. Such an approach will yield distinct P-T segments for various evolutionary stages and will thus provide a far more complete description of the geodynamic evolution of this UHT metamorphic complex in particular and will contribute to a better understanding of UHT metamorphic complexes in general.

南印度地盾的变质岩被认为是地球动力学过程的最佳档案，并为重建印度次大陆前寒武纪地壳演化提供了有价值的工具。马杜赖地块构成印度南部南部麻粒岩地体的一部分，由多种岩石类型组成，包括镁铁质麻粒岩、紫苏花岗岩、含镁铁质麻粒岩、钙质麻粒岩、石英岩、变粒岩、片麻岩、混合岩，特别重要的是阿托希林/可那鲁平-含麻粒岩，因为它们保留了沿着通过捕获结构的变质结晶的特征，因此是潜在的变质作用P-T轨迹的推导工具。迄今为止，马杜赖地块超高温（UHT）变质作用的性质和原因仍未得到解决，文献中提出的P-T路径模型相互矛盾。详细的纹理和岩石学分析被捕的反应纹理的计划，结合假截面的建模。这种方法将产生不同的P-T段的各个演化阶段，从而提供了一个更完整的描述，特别是这种超高温变质杂岩的地球动力学演化，将有助于更好地了解超高温变质杂岩一般。