The Caledonian low Al-TTD series from the Northern Qinling Orogenic Belt: Rock properties, genetic simulation and geolog

A belt of low Al-Trondhjemite-Tonalite-Diorite (TTD) series has been recognized along the Northern Qinling Orogenic Belt (NQOB), which is dated as 430―399 Ma and characteristic of positive εNd(t) values. Geochemical features and trace elements simulation indicate that the TTD series was probably originated from differently partial melting of tholeiitic rocks from the Erlangping group. Thermodynamic analysis on the residue phases of the partial melting pro- cesses suggests that the TTD series may represent a dynamic process of temperature-increasing and pressure-decreasing, indicating an extension and thinning process of a thickened crust.

作 者： TIAN Wei WEI Chunjing   作者單位： School of Earth and Space Sciences, Peking University, Beijing 100871, China  刊 名： 中國(guó)科學(xué)D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES)  年，卷(期)： 2005 48(11)  分類(lèi)號(hào)： P3  關(guān)鍵詞： Northern Qinling   Caledonian movement   Erlangping group   TTD series   trace elements simulation   partial melting   isotopic dating   experimental petrology  

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