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.

南部印度盾牌的变质岩石被认为是地球动力学过程的最佳档案，它是重建印度次大陆前寒武纪地壳进化的宝贵工具。 Madurai街区构成了印度南部南部颗粒状地块的一部分，由多种岩石类型组成，包括镁铁质颗粒，夏诺基，甲壳虫，含sapphirine的颗粒石，钙氯酸酯，摄取，摄取，轻质，leptynite，leptynite，leptynite，gneisses，migmatite等，尤其是sapperine/sapperrine sapppherupine-korn gran ran gran gran corn ran gran cornerion-bran，沿着固定质地沿着前进路径的变质结晶，因此是导致变质P-T轨迹的潜在工具。迄今为止，马杜赖区块中超高温（UHT-）变质的性质和原因尚未解决，文献中呈现了P-T路径的矛盾模型。计划对被捕反应纹理进行详细的质地和岩石学分析，结合伪切断的建模。这种方法将为各种进化阶段产生不同的P-T段，因此将对这种UHT变质复合物的地球动力学演化提供更完整的描述，并将有助于更好地了解一般的UHT变质复合物。