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THE ANALYSIS METHODology OF POLLEN FROM THE MESOZOIC—CENOZOIC RED BEDS IN NORTHERN TIBET

地学前缘 2000年第S1期7卷 186-187页

作者： WT5,5”BZ]Wei Mingjian 1, Wan Xiaoqiao 2, Wang Chengshan 3, Yin Haisheng 3(1.Capital Normal University, Beijing 100037,China 2.China University of Geosciences, Beijing 100083,China 3.Chengdu Institute of Technology, Chengdu 610059,China)

A group of red interbedded sandstone, siltstone and clay\|stone occur in the inland of northern Tibet. During the last 50 years, a lot of researches have been done at this group of beds along the Qinghai\|Xizang highway in the Kekexili area.. According to the lithological characters, the strata have been divided into tow parts, the lower part named as the Feng huoshan group, and the upper part the Yaxicuo group. It is obscure to the age of the strata. For example, Yi jixiang et al. (1990) put them in early Pliocene in the light of the microfossils which they found at the foot of Feng huoshan mountain. The fossils include (1) Charophyta: Rhabdochara? sp ., Peckichara subsphecrica?, Cyrogoniae; (2) Ostracoda: Cypris sp .; (3) Gastropod: Sinoplanorbis sp ., Amnicola sp ., Bithynia sp .; and (4) Sporopollen: Tricoporopollenites nactonodus ?, Polypodiceoisporites, Cyathidites, Schizosporis, Pediastrum. Based on different species of Charophyta, Ostracoda, Gastropod, Bivalve, Sporopollen, Zhang Yifu et al. (1994) refer the strata to Cretaceous. The lower abundance of the fossils from previous research gave lower precision of fossil identification. Thus, the age of the strata was confusion.

关键词： inland of Tibet Cenozoic red beds Pollen analysis method ology

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MINERALIZATION AGES OF GOLD-HYDROTHERMAL DEPOSITS IN NORTHERN ZONE OF EASTERN KUNLUN MOUNTAINS BASED ON FISSION TRACK ANALYSIS

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地学前缘 2000年第S1期7卷 329-330页

作者： Yuan Wanming 1,Wang Shicheng 1,Mo Xuanxue 2,Wang Lanfen 1[WT5,5”BX](1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100080,China 2 China University of Geosciences, Beijing 100083,China)

The age of mineralization in a mining area is a primary factor in various researches related to ore\|forming process. It is that the uncertainty of mineralization ages of gold ore deposits in northern zone of eastern Kunlun Mountains, Qinghai Province, restrains to probe the relationship of the deposits to the regional tectonic evolution. This paper documents the fission track method used to determine the ages of gold ore deposits in eastern Kunlun Mountains and considers the implication for the origin of the *** Kunlun Mountains is the northern part of the Qinghai—Tibet Plateau and is of three deep\|seated fault belts in about EW extension. This work mainly includes three gold ore districts. All of them, in the north of Mid\|Kunlun fault belt, belong to northern part of eastern Kunlun Mountains. The Yanjingou district, with geographical coordinate 96°00’E and 36°10’N, is located 60 km north of Hongqigou district . Both of them are large, typical tectonoalteration gold deposits and were formed in similar geological setting. Hongshuihe ore district is located 50 km east of Yanjingou district and includes tectonoalteration and magmatic cryptoexplosive gold deposits. Outcroped strata are dominantly Jinshuikou Group metamorphic rocks of Lower Proterozoic erathem. The occurrence area of igneous rocks, especially granitoid, accounts for about 90% in first two districts and become less in Hongshuihe district. The gold deposits occur in NW\|striking fault belts. The Rb\|Sr isochron age and K\|Ar isotopic age of Moyite relevant to the gold mineralization are respectively 228 25Ma and 207 1Ma. Rb\|Sr dating of diorite porphyrite is 209 09Ma. Sericite selected from Yanjingou orebody has 252 9Ma K\|Ar age. The ore in Hongqigou district has 197Ma K\|Ar age and 210Ma model age of Pb isotope of galena.

关键词： mineralization age thermal event fission track thermochron ology fission track analysis eastern Kunlun Mountains

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