印度东高止山脉Rayagada正辉石麻粒岩的矿物化学、反应结构、热气压测量和PT路径

R.K. Shaw, M. Arima
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引用次数: 14

摘要

正辉石麻粒岩(charnockites, enderbites和伴生岩)是印度半岛东高止麻粒岩带中北部的Rayagada地区的主要岩性单元之一。岩石学特征表明斜辉岩片岩在正辉岩中普遍存在,尽管在某些情况下也观察到相反的关系。发现了两种化学成分不同的冠状石榴石:一种位于斜长石与正辉石的交界面,另一种位于斜长石的接触面。石榴石-正辉石测温显示温度在840 ~ 700℃之间变化,而两辉石和石榴石-黑云母测温分别在750℃和700℃左右变化。石榴石-正辉石-斜长石-石英的气压测量范围为8.1 ~ 6.8 kbar。从热最大值~ 840°C开始的近等压冷却,随后是减压,这是推导出的压力-温度(PT)路径的特征。这显示了PT路径与相关元尖的显著相似之处。野外和岩石学特征共同表明,这些正辉石麻粒岩至少经历了第二次变形事件(D2),这是该地区主要的韧性变形。这一事件大概发生在1000 Ma左右,可能与东南极洲和冈瓦纳大陆其他碎片的中元古代事件同时发生。
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Mineral chemistry, reaction textures, thermobarometry and PT path from orthopyroxene granulites of Rayagada, Eastern Ghats, India

Orthopyroxene granulites (charnockites, enderbites and associated rocks) form one of the major lithological units in Rayagada, in the north-central sector of the Eastern Ghats Granulite Belt of Peninsular India. Petrographic features show common occurrences of clinopyroxene lamella within orthopyroxene host, although reverse relations have also been observed in some cases. Two types of coronal garnet with different chemical compositions have been noted: one at the interface of orthopyroxene and plagioclase, and the other rimming magnetite, also at the contact of plagioclase. Garnet-orthopyroxene thermometry from these rocks show temperature variations from 840 to 700°C, whereas two-pyroxene and garnet-biotite thermometry yield temperatures around 750 and 700°C, respectively. Garnet-orthopyroxene-plagioclase-quartz barometry ranges from 8.1 to 6.8 kbar. A near-isobaric cooling from a thermal maxima of ∼840°C, followed by decompression is characteristic of the deduced pressure-temperature (PT) path. This shows significant similarities with the PT path derived from associated metapelites. Field and petrographic features collectively suggest that these orthopyroxene granulites have suffered at least the second deformation event (D2), which is the dominant ductile deformation of the area. This event presumably took place around 1000 Ma and might be coeval to the mid-Proterozoic events of East Antarctica and other fragments of Gondwanaland.

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