Discovery of potassic spilite (or poenite) in Langshan Group of Tanyaokou District,Inner Mongolia,China  

作　　者：PENG RunminDepartment of Geology and Mineral Resources , China University of Geosciences, Beijing 100083, China 

出　　处：《Chinese Science Bulletin》1999年第6期563-567,共5页

摘　　要：It is believed that the albite-potash-feldspar-greenschists in the middle Proterozoic Langshan Group in Tanyaokou District are synsedimentary potassic spilite （or poenite） based on the following facts and features: （ ⅰ ） they occur in beds and look blackish （or apple） green and compact; （ ⅱ ） they bear blasto-glomeroporphyritic and blastocrystalloclastic crystals which consist of （altered） albite laths with hollow skeleton crystal texture in which there are slender dark strips and minor pyroxene, and blasto-amygdaloid filled with pyrite, chlorite, magnetite, etc.; （ ⅲ ） the results of the petrochemical diagrams show that they are orthometamorphites; （ Ⅳ ） Sm-Nd isotopic age of them is 1 824 Ma (model age (t_DM) is 2 006—2 132 Ma).It is believed that the albite-potash-feldspar-greenschists in the middle Proterozoic Langshan Group in Tanyackou District are synsedimentary potassic spilite (or poenite) based on the following facts and features: (i) they occur in beds and look blackish (or apple) green and compact; (ii) they bear blasto-glomeroporphyritic and blastocrystalloclastic crystals which consist of (altered) albite laths with hollow skeleton crystal texture in which there are slender dark strips and minor pyroxene, and blasto-amygdaloid filled with pyrite, chlorite, magnetite, etc.; (iii) the results of the petrochemical diagrams show that they are orthometamorphites; (iv) Sm-Nd isotopic age of them is 1 824 Ma (model age (tDM) is 2 006–2 132 Ma).

关 键 词：POTASSIC SPILITE (or poenite) MIDDLE PROTEROZOIC Tanyaokou Deposit INNER Mongolia. 

分 类 号：P618.7[天文地球—矿床学]