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| 1 | 三江北段晚三叠世构造-岩浆作用和几个相关的科学问题显示文摘中国西南三江北段的松潘-甘孜褶皱带和义敦地体以强烈的晚三叠世构造-岩浆活动为特征。松潘-甘孜褶皱带的岩浆活动主要发生在228~190 Ma(峰期时代为约210 Ma),略晚于义敦地体的岩浆活动(236~200 Ma,峰期时代为约216 Ma)。金沙江洋可能经历了西向和东向的双向俯冲,于晚二叠世末-早三叠世初闭合,甘孜-理塘洋可能是金沙江洋东向俯冲背景下形成的弧后盆地,在217 Ma以前已经闭合。松潘-甘孜褶皱带和义敦地体晚三叠世岩浆岩均属于碰撞后岩浆作用的产物,可能分别与岩石圈拆沉和东向俯冲的金沙江洋俯冲板片的断离有关。这些晚三叠世碰撞后岩浆活动记录了地幔物质的贡献,幔源镁铁质岩浆的结晶分异作用在中酸性岩浆岩的形成过程中起到了重要作用,反映了地壳的净生长。三叠纪不同地体之间的碰撞导致了明显造山作用,造成了具有空间差异性的地壳增厚和山脉隆升。 | 朱弟成 王青 詹琼窑 谢锦程 | 2021 | 沉积与特提斯地质2021，41，2： | 10 |
| 2 | Metallogeny of the Baiyangping Lead-Zinc Polymetallic Ore Concentration Area, Northern Lanping Basin of Yunnan Province, China显示文摘The Lanping Basin in the Nujiang-Lancangjiang-Jinshajiang(the Sanjiang) area of northeastern margin of the Tibetan Plateau is an important part of eastern Tethyan metallogenic domain. This basin hosts a number of large unique sediment-hosted Pb-Zn polymetallic deposits or ore districts, such as the Baiyangping ore concentration area which is one of the representative ore district. The Baiyangping ore concentration area can be divided into the east and west ore belts, which were formed in a folded tectogene of the India-Asia continental collisional setting and was controlled by a large reverse fault. Field observations reveal that the Mesozoic and Cenozoic sedimentary strata were outcropped in the mining area, and that the orebodies are obviously controlled by faults and hosted in sandstone and carbonate rocks. However, the ore-forming elements in the east ore belt are mainly Pb-Zn-Sr-Ag, while Pb-Zn-Ag-Cu-Co elements are dominant in the west ore belt. Comparative analysis of the C-O-Sr-S-Pb isotopic compositions suggest that both ore belts had a homogeneous carbon source, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata; the oreforming fluids were originated from formation water and precipitate water, which belonged to basin brine fluid system; sulfur was from organic thermal chemical sulfate reduction and biological sulfate reduction; the metal mineralization material was from sedimentary strata and basement, but the difference of the material source of the basement and the strata and the superimposed mineralization of the west ore belt resulted in the difference of metallogenic elements between the eastern and western metallogenic belts. The Pb-Zn mineralization age of both ore belts was contemporary and formed in the same metallogenetic event. Both thrust formed at the same time and occurred at the Early Oligocene, which is consistent with the age constrained by field geological relationship. | WANG Xiaohu SONG Yucai ZHANG Hongrui LIU Yingchao PAN Xiaofei GUO Tao | 2018 | Acta Geologica Sinica(English Edition)2018，92，4： | 5 |
| 3 | LA-ICP-MS U-Pb Geochronology of Detrital Zircon in the Guanzhong Basin, China and Its Tectonic Response显示文摘The Guanzhong Basin in the transitional zone of theQinling orogenic belt and the southern margin of theOrdos Basin has been extensively studied in recent years.Although some results have been obtained, some problemssuch as whether the materials from the North China cratonand the Qinling orogenic belt are detrital sedimentaryrocks of the Guanzhong Basin still remain unresolved.Detrital sedimentary rocks contain information about thesource area; therefore. | DONG Min WANG Zongxiu DONG Hui MA Licheng ZHANG Linyan | 2018 | Acta Geologica Sinica(English Edition)2018，92，3： | 1 |
| 4 | Comparative Study of Gacun and Youre Silver–Lead–Zinc–Copper Deposits in Sichuan, SW China, and their Mineralization Significance显示文摘The large Gacun silver–lead–zinc–copper deposit in Sichuan Province is one of the largest volcanogenic massive sulfide(VMS) deposits in China. The deposit consists of western and central ore bodies, which form a vein–stockwork mineralization system corresponding to hydrothermal channels, and eastern ore bodies, which form an exhalative chemical sedimentary system derived from a brine pool in a submarine basin. The Youre lead–zinc deposit, which is currently under exploration and lies adjacent to the southern part of the Gacun deposit, is characterized by intense silicification and vein–stockwork structures and consists of massive silicified rhyolitic volcanics, banded rhyolitic tuff, and phyllitic sericite tuff. From a comparison of their ore-bearing horizons, the Gacun and Youre deposits have a continuous and stable hanging wall(calcareous slate and overlying andesite) and foot wall(rhyolite–dacite breccia and agglomerate), and the lithologic sequence includes lower intermediate to felsic rocks and upper felsic rocks. Thus, the Youre deposit, which comprises relatively thinly layered low–grade ore, is regarded as forming a southward extension of the Gacun deposit. A further comparison of the structures of the ore-bearing belts between the two deposits suggests that the Youre ore bodies are similar to the western ore bodies of the Gacun deposit. Moreover, the characteristics of fluid inclusions and stable isotopes in the Youre deposit are also similar to those of the western ore bodies of the Gacun deposit. Genetic models of the deposits are proposed for the Gacun–Youre ore district, and massive concealed ore bodies may occcur in the Youre deposit at depths that are similar to those of the eastern ore bodies of the Gacun deposit. | DANG Yuan CHEN Maohong FU Bin XUE Zhiqiang | 2018 | Acta Geologica Sinica(English Edition)2018，92，1： | 1 |
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