构造作用对四川盆地东部垫江盐盆三叠系嘉陵江组海相钾盐成矿——保存条件的影响
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摘要
通过分析四川盆地东部垫江盐盆三叠纪嘉陵江成盐期构造演化及后期构造作用,结合大地电磁测深和地震资料解译等综合分析初步认为垫江盐盆三叠纪嘉陵江期,在整体海退的条件下,由于泸州—开江古隆起的逐步形成,在长寿合兴地区和垫江董家场地区形成有利于古卤水浓缩的次级凹陷。早白垩世末期川东褶皱带的形成虽然对三叠系含盐地层进行了改造,但次级凹陷位于向斜核部和褶皱倾末端,未受到风化剥蚀。同时,大地电磁测深和地震资料显示深部没有断裂构造穿过次级凹陷区域,初步证明具有较好的保存条件。
Based on the analysis of the tectonic evolution and late-stage tectonics of the Dianjiang Salt Basin in the eastern Sichuan Basin,combined with magnetotelluric sounding method and seismic data interpretation,this paper holds that there are two sub-depressions in the Dianjiang Salt Basin. Both Hexing sub-depression and Dongjiachang sub-depression are advantageous to the concentration of ancient brine. Although the formation of the eastern Sichuan fold belt in the late Early Cretaceous reformed the Triassic salt-bearing strata,the secondary depression area was located at the syncline core and the end of the fold dip,and was not subjected to weathering. Meanwhile,the magnetotelluric sounding and seismic data showed that no fault structure existed in the two depression area,indicating the well preservation conditions.
Based on the analysis of the tectonic evolution and late-stage tectonics of the Dianjiang Salt Basin in the eastern Sichuan Basin,combined with magnetotelluric sounding method and seismic data interpretation,this paper holds that there are two sub-depressions in the Dianjiang Salt Basin. Both Hexing sub-depression and Dongjiachang sub-depression are advantageous to the concentration of ancient brine. Although the formation of the eastern Sichuan fold belt in the late Early Cretaceous reformed the Triassic salt-bearing strata,the secondary depression area was located at the syncline core and the end of the fold dip,and was not subjected to weathering. Meanwhile,the magnetotelluric sounding and seismic data showed that no fault structure existed in the two depression area,indicating the well preservation conditions.
引文
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[11]刘成林,吴驰华,王立成,等.中国陆块海相盆地成钾条件与预测研究进展综述[J].地球学报,2016,37(5):581-606.LIU Chenglin,WU Chihua,WANG Licheng,et al.Advance in the study of forming condition and prediction of potash deposits of marine basins in China's small blocks:review[J].Acta Geoscientica Sinica,2016,37(5):581-606.(in Chinese with English abstract)
[12]刘成林,宣之强,曹养同,等.探索中国陆块找钾---中国东特提斯域成钾作用及模式[J].化工矿产地质,2015,37(4):193-197.LIU Chenglin,XUAN Zhiqiang,CAO Yangtong,et al.Research on potash exploration at China Land Mass-potash alteration and pattern of eastern Tethys Ocean,China[J].Geology of Chemical Minerals,2015,37(4):193-197.(in Chinese with English abstract)
[13]LIU C L,JIAO P C,LF L,et al.The impact of the linked factors of provenance,tectonics and climate on potash formation:an example from the potash Deposits of Lop Nur depression in Tarim Basin,Xinjiang,Western China[J].Acta Geologica Sinica(English Edition),2015,89(6):2030-2047.
[14]万天丰,朱鸿.古生代与三叠纪中国各陆块在全球古大陆再造中的位置与运动学特征[J].现代地质,2007,21(1):1-13.WAN Tianfeng,ZHU Hong.Positions and kinematics of Chinese continental blocks in reconstruction of global paleocontinents for Paleozoic and Triassic[J].Geoscience,2007,21(1):1-13.(in Chinese with English abstract)
[15]张维宸.四川盆地中新生代区域构造格架与构造演化过程研究[D].北京:中国地质大学(北京),2009.ZHANG Weichen.Tectonic framework and tectonic evolution of the Sichuan Basin in the Mesozoic and Cenozoic[D].Beijing:China University of Geosciences(Beijing),2009.(in Chinese with English abstract)
[16]赵艳军,刘成林,龚大兴,等.泸州-开江古隆起对川东三叠纪成盐成钾环境的控制作用[J].地质学报,2015,89(11):1983-1989.ZHAO Yanjun,LIU Chenglin,GONG Daxing,et al.The Luzhou-Kaijiang Paleouplift control on the formation environments of triassic salt and potassium of deposits in eastern Sichuan[J].Acta Geologica Sinica,2015,89(11):1983-1989.(in Chinese with English abstract)
[17]蔡克勤,袁见齐.四川三叠系钾盐成矿条件和找矿方向[J].化工地质,1986,(2):1-9.CAI Keqin,YUAN Jianqi.Metallogenic conditions and prospecting direction of Triassic potash in Sichuan[J].Geology of Chemical Minerals,1986,(2):1-9.(in Chinese with English abstract)
[18]胡召齐,朱光,张必龙,等.上扬子北部褶皱带的构造应力场演化规律[J].地质科学,2010,45(2):361-379.HU Zhaoqi,ZHU Guang,ZHANG Bilong,et al.Tectonic stress field evolution in fold belts in the northern upper Yangtze region[J].Chinese Journal of Geology,2010,45(2):361-379.(in Chinese with English abstract)
[19]胡召齐.上扬子地区北部构造演化与热年代学研究[D].合肥:合肥工业大学,2011.HU Zhaoqi.Studies of tectonic evolution and thermochronology in the northern upper Yangtze region[D].Hefei:Hefei University of Technology,2011.(in Chinese with English abstract)
[2]陈安清,王立成,姬广建,等.川东北早-中三叠世聚盐环境及海水浓缩成钾模式[J].岩石学报,2015,31(9):2757-2769.CHEN Anqing,WANG Licheng,JI Guangjian,et al.Evaporatic environment and the concentration model of potash in the Early-Middle Triassic,Northeastern Sichuan Basin[J].Acta Petrologica Sinica,2015,31(9):2757-2769.(in Chinese with English abstract)
[3]孙小虹,胡宇飞,刘成林,等.四川盆地三叠纪古盐湖已达钾石盐析出阶段---来自石盐流体包裹体化学组成的约束[J].矿床地质,2016,35(6):1157-1168.SUN Xiaohong,HU Yufei,LIU Chenglin,et al.Argument that brine of salty lake in Sichuan basin had reached crystallizing point of potash minerals during Triassic:Evidence from chemical composition of fluid inclusions in halite[J].Mineral Deposits,2016,35(6):1157-1168.(in Chinese with English abstract)
[4]唐清敏,张雄,朱正杰,等.四川盆地东部垫江凹陷三叠系嘉陵江组岩盐氯同位素特征与成钾指标研究[J].地质学报,2018,92(8):1671-1679.TANG Qingmin,ZHANG Xiong,ZHU Zhengjie,et al.Chlorine isotopic composition and potash-forming indicator of Halites of the Triassic Jialingjiang Formation in the Dianjiang Depression,eastern Sichuan Basin[J].Acta Geologica Sinica,2018,92(8):1671-1679.(in Chinese with English abstract)
[5]许建新,马海州,肖应凯,等.稳定氯同位素及其应用地球化学研究[J].盐湖研究,2008,16(1):51-59.XU Jianxin,MA Haizhou,XIAO Yingkai,et al.Stable chlorine isotope and its research on applied geochemistry[J].Journal of Salt Lake Research,2008,16(1):51-59.(in Chinese with English abstract)
[6]张雄,朱正杰,赵艳军,等.四川盆地东部垫江盐盆三叠系嘉陵江组成钾远景分析[J].地质学报,2018,92(8):1661-1670.ZHANG Xiong,ZHU Zhengjie,ZHAO Yanjun,et al.Prospect analysis of potash forming of the Triassic Jialingjiang Formation in the Dianjiang salt basin in eastern Sichuan[J].Acta Geologica Sinica,92(8):1661-1670.(in Chinese with English abstract)
[7]崔启晨.四川盆地川东三叠系(含盐系)及卤水地球化学特征研究[D].北京:中国地质大学(北京),2015.CUI Qichen.A research on the geochemistry characteristics of Triassic salt-bearing series in the east of Sichuan basin and Triassic brine in Sichuan basin[D].Beijing:China University of Geosciences(Beijing),2015.(in Chinese with English abstract)
[8]黄建国.中国三叠纪钾盐沉积--以四川为例[J].岩相古地理,1998,18(4):23-43.HUANG Jianguo.The Triassic potash deposits in China:an example from the Sichuan Basin[J].Sedimentary Facies and Palaeogeography,1998,18(4):23-43.(in Chinese with English abstract)
[9]汪明泉.四川盆地东部早中三叠世古水温及其成钾效应[D].北京:中国地质大学(北京),2016.WANG Mingquan.Paleotemperature and its potash-forming effect in early and middle Triassic in eastern Sichuan Basin[D].Beijing:China University of Geosciences(Beijing),2016.(in Chinese with English abstract)
[10]周家云,龚大兴,李萌.四川盆地三叠纪蒸发岩特征、盐盆迁移及其构造控制[J].地质学报,2015,89(11):1945-1952.ZHOU Jiayun,GONG Daxin,LI Meng.The characteristic of evaporite,migration of salt basins and its tectonic control in Triassic Sichuan Basin[J].Acta Geologica Sinica,2015,89(11):1945-1952.(in Chinese with English abstract)
[11]刘成林,吴驰华,王立成,等.中国陆块海相盆地成钾条件与预测研究进展综述[J].地球学报,2016,37(5):581-606.LIU Chenglin,WU Chihua,WANG Licheng,et al.Advance in the study of forming condition and prediction of potash deposits of marine basins in China's small blocks:review[J].Acta Geoscientica Sinica,2016,37(5):581-606.(in Chinese with English abstract)
[12]刘成林,宣之强,曹养同,等.探索中国陆块找钾---中国东特提斯域成钾作用及模式[J].化工矿产地质,2015,37(4):193-197.LIU Chenglin,XUAN Zhiqiang,CAO Yangtong,et al.Research on potash exploration at China Land Mass-potash alteration and pattern of eastern Tethys Ocean,China[J].Geology of Chemical Minerals,2015,37(4):193-197.(in Chinese with English abstract)
[13]LIU C L,JIAO P C,LF L,et al.The impact of the linked factors of provenance,tectonics and climate on potash formation:an example from the potash Deposits of Lop Nur depression in Tarim Basin,Xinjiang,Western China[J].Acta Geologica Sinica(English Edition),2015,89(6):2030-2047.
[14]万天丰,朱鸿.古生代与三叠纪中国各陆块在全球古大陆再造中的位置与运动学特征[J].现代地质,2007,21(1):1-13.WAN Tianfeng,ZHU Hong.Positions and kinematics of Chinese continental blocks in reconstruction of global paleocontinents for Paleozoic and Triassic[J].Geoscience,2007,21(1):1-13.(in Chinese with English abstract)
[15]张维宸.四川盆地中新生代区域构造格架与构造演化过程研究[D].北京:中国地质大学(北京),2009.ZHANG Weichen.Tectonic framework and tectonic evolution of the Sichuan Basin in the Mesozoic and Cenozoic[D].Beijing:China University of Geosciences(Beijing),2009.(in Chinese with English abstract)
[16]赵艳军,刘成林,龚大兴,等.泸州-开江古隆起对川东三叠纪成盐成钾环境的控制作用[J].地质学报,2015,89(11):1983-1989.ZHAO Yanjun,LIU Chenglin,GONG Daxing,et al.The Luzhou-Kaijiang Paleouplift control on the formation environments of triassic salt and potassium of deposits in eastern Sichuan[J].Acta Geologica Sinica,2015,89(11):1983-1989.(in Chinese with English abstract)
[17]蔡克勤,袁见齐.四川三叠系钾盐成矿条件和找矿方向[J].化工地质,1986,(2):1-9.CAI Keqin,YUAN Jianqi.Metallogenic conditions and prospecting direction of Triassic potash in Sichuan[J].Geology of Chemical Minerals,1986,(2):1-9.(in Chinese with English abstract)
[18]胡召齐,朱光,张必龙,等.上扬子北部褶皱带的构造应力场演化规律[J].地质科学,2010,45(2):361-379.HU Zhaoqi,ZHU Guang,ZHANG Bilong,et al.Tectonic stress field evolution in fold belts in the northern upper Yangtze region[J].Chinese Journal of Geology,2010,45(2):361-379.(in Chinese with English abstract)
[19]胡召齐.上扬子地区北部构造演化与热年代学研究[D].合肥:合肥工业大学,2011.HU Zhaoqi.Studies of tectonic evolution and thermochronology in the northern upper Yangtze region[D].Hefei:Hefei University of Technology,2011.(in Chinese with English abstract)
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