西藏尼木地区双壳类化石的发现及其对相关地层的厘定

基金项目:

中国地质调查局“冈底斯—喜马拉雅铜资源基地调查”二级项目（121201010000150014）子项目“西藏尼木地区1:5万区域地质调查”项目

详细信息

The discovery of bivalve fossils in Nimu area in Tibet and determination of related strata

Northwest Sichuan Geological Team, Sichuan Bureau of Exploration and Development of Geology and Mineral Resources, Mianyang 621000, Sichuan, China

图 1 含双壳化石地层地质剖面图（a）及地质简图（b）

1—第四系；2—麻木下组；3—构造岩石地层单位；4—渐新世似斑状正长花岗岩；5—渐新世—始新世似斑状二长花岗岩；6—始新世二长花岗岩；7—始新世花岗闪长岩；8—始新世石英闪长岩；9—始新世闪长岩；10—晚白垩世石英闪长岩；11—黑云斜长麻粒岩；12—透辉石大理岩；13—黑云斜长片岩；14—地质界线/逆冲断层；15—正断层/分层号

Figure 1. Geological section (a) and geological sketch map (b) of a bivalve fossil-bearing stratum

1-Quaternary; 2-Mamuxia Formation; 3-Tectonic rock stratigraphic unit; 4-Oligocene porphyritic syenite; 5-Oligocene-Eocene porphyritic monzonite; 6-Eocene monzonite; 7-Eocene granodiorite; 8-Eocene quartz diorite; 9-Eocene diorite; 10-Late Cretaceous quartz diorite; 11-Biotite plagioclase granulite; 12-Diopside marble; 13-Biotite plagioclase schist; 14-Geological boundary / thrust fault; 15-Normal fault / stratification number

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图 2 双壳化石野外宏观照片

Figure 2. The macroscopic photos of the bivalve fossils

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