四川盆地北缘构造热演化史与中—新生代隆升研究
发布时间：2018-08-07 19:39
【摘要】：研究区位于扬子地台北缘,秦岭造山带南侧,该区富含Pb、Zn、Au、Cu、Hg、Ag、Sb、Mn、V、U、As等多种金属元素,是我国最重要的多金属成矿带之一,目前已发现多个大型-超大型金属矿床。此外,该区发育极好的生、储、盖组合条件和优越的构造圈闭及成藏条件,具有良好的含油气远景,其含油气潜力和勘探远景被大家所关注。研究区以Pb、Zn等为代表的层控型浅成低温热液矿床形成深度一般在1500m内,温度介于50℃~200℃之间,矿床形成后的构造抬升剥蚀作用对其勘探潜力评价极为重要。同样地,后期构造隆升对油气藏的形成和保存条件具有重要影响,目前普遍认为中生代以来的构造演化控制了气藏的成藏特征和成藏模式。本文使用地层回剥技术恢复和重建研究区的沉积史。大巴山经历了三个演化阶段:①太古宙~元古宙基底形成阶段,其中震旦系的沉积速率约为6.11m/Ma;②寒武纪~二叠纪碳酸盐岩台地沉积阶段;③中~新生代陆内造山~前陆盆地构造演化阶段。碑坝穹窿经历了三个演化阶段:①基底形成演化阶段;②古生代盆地构造演化阶段;③中生代造山构造演化阶段。应用磷灰石裂变径迹反演研究区的热历史,结果表明:大巴山构造带和碑坝穹窿分别于153Ma和135Ma开始隆升,都受到燕山运动的影响,由于碑坝穹窿受汉南古陆的阻挡,燕山运动对其影响较晚,故开始隆升时间也较晚。大巴山构造带和碑坝穹窿都在153Ma~80Ma期间处于较快速的隆升状态,这一隆升剥蚀反映了研究区白垩纪的区域性剥蚀事件。大巴山构造带和碑坝穹窿在5Ma(或7Ma)有一次极快速的隆升剥蚀过程,此时青藏高原的东部和东北部抬升加剧,再次激活了秦岭一带的老构造并导致了大巴山显著的剥蚀,汉南穹窿-米仓山一带作为秦岭的南缘也受到了影响。另外,在中新世以来发生的气候环境的巨变对研究区的快速剥蚀也具有极大的影响。
[Abstract]:The study area is located in the Taibei margin of the Yangtze platform and the southern side of the Qinling orogenic belt. It is rich in various metal elements, such as PbPbZZZZOU, HgCU, SbAg-Mn-MNMn-VGU / as, and is one of the most important polymetallic metallogenic belts in China. At present, several large and super-large metal deposits have been discovered in the study area, which is one of the most important polymetallic metallogenic belts in China. In addition, the area is well developed in terms of source, reservoir, cap assemblage, favorable structural traps and reservoir forming conditions, and has a good oil and gas potential, and its oil and gas potential and exploration prospects have attracted much attention. In the study area, the formation depth of stratabound epithermal hydrothermal deposits, such as Pb, Zn, and so on, is generally within 1500 m and the temperature is between 50 鈩，
本文编号：2171141
[Abstract]:The study area is located in the Taibei margin of the Yangtze platform and the southern side of the Qinling orogenic belt. It is rich in various metal elements, such as PbPbZZZZOU, HgCU, SbAg-Mn-MNMn-VGU / as, and is one of the most important polymetallic metallogenic belts in China. At present, several large and super-large metal deposits have been discovered in the study area, which is one of the most important polymetallic metallogenic belts in China. In addition, the area is well developed in terms of source, reservoir, cap assemblage, favorable structural traps and reservoir forming conditions, and has a good oil and gas potential, and its oil and gas potential and exploration prospects have attracted much attention. In the study area, the formation depth of stratabound epithermal hydrothermal deposits, such as Pb, Zn, and so on, is generally within 1500 m and the temperature is between 50 鈩，
本文编号：2171141
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