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In the eastern South China Block (SCB), the presence of middle Paleozoic volcanics and mafic rocks is poor in spite of the extensive occurrence of granites in response to the synchronous (Kwangsian) intracontinental orogen event. The nature of the lithosphere and its associated orogenic process are poorly known for such a major orogen. In this paper, a set of new U–Pb zircon geochronological, elemental...
To constrain temporal–spatial patterns of the Kwangsian and Indosinian orogenic events and the Phanerozoic tectonic evolution of the eastern South China Block, this paper documents the zircon U–Pb geochronology of the high-grade metamorphic rocks for key outcrops in the eastern SCB and the P–T path for the Indosinian metamorphic amphibolites. Our data show that the representative amphibolites from...
The Xiaodingxi and Manghuihe volcanic sequences represent key components of the Lancangjiang igneous zone in southwest China. Their petrogenesis provides important constraints on the tectonic evolution of the eastern Paleotethys ocean. The basaltic rocks from the Xiaodingxi and Manghuihe sequences yield SHRIMP zircon U–Pb weighted mean ages of 214±7Ma and 210±22Ma, respectively, which is 15–20Ma younger...
The Indosinian granites in the South China Block (SCB) have important tectonic significance for the evolution of East Asia. Samples collected from Hunan Province can be geochemically classified into two groups. Group 1 is strongly peraluminous (A/CNK>1.1), similar to S-type granites, and Group 2 has A/CNK=1.0–1.1, with an affinity to I-type granites. Group 1 has lower FeOt, Al 2 O 3...
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