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• W2380551983 abstract "The pre-pilot drillhole CCSD-PP1 of Chinese Continental Drilling Project, with a depth of 432.08 m, is located in Zhimafang, southeastern Donghai County. Core samples from CCSD-PP1 consist mainly of gneiss-granitic gneiss, ultramafic rocks and eclogite with small amounts of phengite quartzite, amphibolite and hornblende-biotite schist. According to the petrographical and geochemical characteristics, the protoliths of gneisses are a sequence of relatively high-maturity clastic sedimentary rocks lower- maturity acid volcanic rocks and clastic sedimentary rocks, which experienced ultrahigh-pressure (UHP) metamorphism together with the eclogites as intercalated layers in the gneisses. The granitic gneisses may be divided into three types: epidote-pyrite mon-zogranitic gneiss, epidote-biotite monzogranitic gneiss and epidote-two mica monzonitic migmatitic gneiss. The SiO2 content of the epidote-pyrite monzogranitic gneiss is the highest, ranging from 76. 72% to 78. 86%, with intense negative Eu and Ba anomalies, Eu/Eu* =0. 125-0. 164 and Ba/Ba* =0. 095-0. 396. The rare earth element (REE) and trace element distribution patterns are silimar to those of granite formed by partial melting of clastic sedimentary rocks with very high maturity. Coesite-bearing UHP mineral inclusions were identified in zircons separated from this kind of granitic gneiss. These features indicate that this kind of granitic gneiss may have been formed by the following genetic mechanism: the magma formed by partial melting of clastic sedimentary rocks with very high maturity, intruded into the supercrustal rocks of gneisses prior to the formation of the Sulu UHP metamorphic belt, and then crystallized and experienced ultrahigh-pressure metamorphism. However, in the epidote-biotite monzogranitic gneiss and migmatitic gneiss, the SiO2 contents are much lower than that of epidote-pyrite monzogranitic gneiss. The REE and trace element distribution patterns are much different from that of epidote-pyrite monzogranitic gneiss. In addition, no-UHP mineral inclusions were identified in zircons separated from these two kinds of granitic rocks. These features indicate that the epidote-biotite monzogranitic gneiss and migmatized gneiss may have been formed by the anatexit of gneisses in the peak UHP stage and the first stage of near-isothermal depression in the process of exhumation of the Sulu terrane. This research may have important significance for an in-depth study of the genetic relationship between metamorphism and granitic magmatism and its geological dynamics in the Sulu UHP metamorphic belt." @default.
• W2380551983 created "2016-06-24" @default.
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• W2380551983 date "2001-01-01" @default.
• W2380551983 modified "2023-09-26" @default.
• W2380551983 title "Petrology and Geochemistry of Gneiss and Granitic Gneiss from Pre-pilot Drillhole (CCSD-PP1), Chinese Continental Scientific Drilling Project" @default.
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