《中国地质科学院院报 西安地质矿产研究所分刊 第2卷 第1号 1981年》

BULLETIN OF THE CHINESE ACADEMY OFGEOLOGICAL SCIENCESSERIES XVol.2 No.1

CONTENTSCambrian-Ordovician Boundary and Their Related Trilobites in theHangula Region,W.Nei Monggol Lu Yanhao,Zhou Zhiyi and Zhou Zhiqiang16

Tectonjsm During Metallization of Dadaoerji Chromite Deposit inNorthwest China Dong Xianyang and Li jinming37

A Preliminary Study on the General Tectonic Characters and Evolu-tion of North Qilian Mts Zhou Liangren,Qin Keling and Zhang Zhengxiang51

The Characteristics of the Weiya Intrusive in Chinese Tian Shan,with a Discussion on Its Mode of Formation Li Xianzi62

X-Ray Powder Research on Cation Composition and Distribution ofChrome Spinellides Xu Peicang,Li jingxian and Zhang Xiaoyun72

Olivine Geothermometer Xia Linqi82

Late Cretaceous Ostracods from the Yabrai Basin,Nei Monggol andTheir Stratigraphic Significance Qi Hua98

Middle and Upper Ordovician Stratigraphy at Taoqupo,Yaoxian,Shaanxi and Its Correlation Fu Lipu111

The Establishment of a New Family Trypanoporidae and Its Signifi-cance Li Yaoxi118