Title: Determination of the Magma Depth of the Mesozoic Adakitic Rocks in the Xuzhou—Suzhou Area: Evidence from p-T Estimation of Deep-seated Xenoliths
Abstract: The Mesozoic intrusive complex in the Xuzhou—Suzhou area is compos ed mainly of monzodioritic porphyry-diorite-monzonite, which belong to the calc-alkalin e rock series. Petrology and geochemistry of the Mesozoic intrusive complex are similar to those of typical adakites. Therefore, the Mesozoic intrusive complex might be called adakitic rock. Eclogite, garnet gneiss xenoliths and relic garne ts often occur in the Mesozoic intrusive complex. Petrography of the deep-seate d xenoliths indicates that the eclogite xenoliths were trapped in the host magma after they were subjected to eclogite facies metamorphism and amphibolite facie s retrogressive metamorphism. The results of mineral balance p-T estimation show that thep-T conditions of eclogite facies metamorphism and amphibolit e facies retrogressive metamorphism are 608~766℃ and 523~800℃,0 50~0 98 GPa, r espectively. It can be concluded that the parental magma of the Mesozoic intrusi ve complex could be as deep as 20~34 km in the crust, that is, the magma was der ived from the deep crust.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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Cited By Count: 1
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