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夹皮沟金矿带是中生代构造-岩浆-成矿作用的产物,矿脉直接受脆性断裂控制,控矿构造类型分为空间方位型和外接触带断裂型。矿脉我性特征揭示出夹皮沟和带与石棚鑫在洞金矿为低序次与高序次关系。 相似文献
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义敦岛弧是中国西南三江地区多岛弧盆系中十分关键的构造单元,更是研究全球碰撞造山作用的天然实验室,其所蕴含的矿产资源潜力巨大。构造对成矿作用的时空分布具有极明显的控制作用,由此本文总结并提出义敦岛弧造山带三大成矿作用:1印支晚期俯冲造山弧间裂谷成矿作用;2燕山晚期造山后伸展成矿作用;3喜马拉雅期陆内汇聚与走滑成矿作用。本文在总结前人大量研究的基础上,以大地构造理论为依托,结合区域地层概况,对该区构造动力演化和转换体制及其与成矿作用的相互关系等方面进行深度剖析,以期能对人们在该区进行成矿理论研究和找矿预测等方面提供帮助和指导。 相似文献
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通过对河台金矿含矿构造带的构造演化过程与剪切带演化过程中的金成矿研究,结果表明,深层韧性剪切作用在早中海西期形成糜棱岩带——容矿构造带(当期金迁出)、晚海西期和印支期(重要的成矿时期)提供含金热液,燕山期以后对金成矿的作用不明显。印支期,侵入作用为金成矿提供大量热液,对金进一步富集起重要作用。 相似文献
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伊春-延寿构造带是重要的多金属成矿带,已发现多处钼矿。本文将伊春-延寿构造带成矿构造背景划分为加里东期成矿系列和印支期成矿系列。加里东期成矿系列形成于松嫩和佳木斯地块拼合、碰撞造山的大地构造背景。印支期成矿系列则形成于板内拉分-走滑的构造环境。在古太平洋俯冲挤压的背景下,与板块俯冲体制下的挤压向伸展转换的过程中,形成了一系列深大断裂带,幔源物质上涌形成了该区中生代构造岩浆岩带和相关的斑岩型钼矿床。以该构造带内的鹿鸣斑岩型钼矿床和霍吉河斑岩型钼矿床为对比分析研究对象,研究了与成矿有关的地层、构造、岩浆岩和变质岩,分析了斑岩型钼矿床地质特征及找矿标志。认为斑岩型钼矿的主要成矿时代为燕山早期;围岩蚀变呈面型展布,以钾化、石英-绢云母化为主;霍吉河钼矿床和鹿鸣钼矿床的斑岩体及围岩为偏铝质过铝质、高钾钙碱性系列的 I型花岗岩,具有类似于活动大陆边缘花岗岩的岩石组合特征。同时对伊春-延寿构造带内的找矿潜力做了评价。 相似文献
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阳山金矿带内构造变形复杂强烈,对构造变形特征的系统研究表明:阳山金矿带内发育有A型线理、石香肠、旋转碎斑等构造,这些构造大部分都表现出由北向南的韧-脆性剪切特征;对褶皱轴面产状的统计表明其主应力方向为近南北向;利用石英颗粒动态重结晶法得到古应力值为45.55 MPa。结合蠕变方程得到变形平均应变速率为3.6×10-10s-1;根据矿物显微变形特征认为变形形成温度为280~400℃,应发生于地壳深度不超过12 km的范围内;依据斜长花岗斑岩形成时间及地层变形特征,认为剪切变形形成于晚三叠世—早白垩世;结合阳山金矿成矿特点,认为该剪切对本区金的活化、迁移富集以及最终金矿体的最终定位,有着极其重要的控制作用。 相似文献
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雪峰弧形构造带金矿类型及分布特征 总被引:1,自引:0,他引:1
文中从总结雪峰弧形构造带内各典型金矿床地质特征入手,提出一个简明的金矿床分类方案,将区内金矿床类型分为石英脉型金矿与蚀变岩型金矿2个大类,石英脉型金矿又分为顺层与切层石英脉型2个亚类,蚀变岩型金矿分为破碎带蚀变岩型、韧性剪切带蚀变岩型与破碎蚀变砂岩型3个亚类,并阐述了不同类型的金矿与不同的地层岩性及构造组合之间的关系,以期指导区内金矿床勘查及开发工作. 相似文献
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断山南构造混杂岩带岛弧型火山岩主要岩性为灰绿色蚀变英安岩和蚀变安山岩。岛弧型火山岩微量元素地球化学特征显示明显富集Ba、Th、U等大离子亲石元素,亏损Nb、P、Ti等高场强元素;稀土元素地球化学特征显示轻重稀土分馏明显,Eu负异常较为明显。通过同位素测年,蚀变安山岩形成年龄为481.2±8.3 Ma,形成于晚寒武世-早奥陶世。岩石学、地球化学和年代学特征表明,岛弧型火山岩可能为板块碰撞前俯冲作用背景下火山弧环境的产物。 相似文献
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LIU Shuwen LI Qiugen TIAN Wei WANG Zongqi YANG Pengtao WANG Wei BAI Xiang GUO Rongrong 《Canadian Metallurgical Quarterly》2011,85(3)
South Qinling Tectonic Belt (SQTB) is located between the Shangzhou-Danfeng and Mianxian-Lueyang sutures. There are a lot of early Mesozoic granitoid plutons in its middle segment,comprising the Dongjiangkou-Zhashui granitoid plutons at the northeast, Huayang-Wulong-Laocheng granitoid plutons at the central part, Xiba granitoid pluton at the northwest and Guangtoushan-Liuba granitoid plutons at the southwest. These Indonisian granitoids contain a mass of various scale mafic enclaves, which show sometimes clear boundaries and sometimes transitional boundaries with their host granitoids. These granitoids also exhibit metaluminous to peraluminous series, commonly higher Mg# and a wide range of petrochemistry from low-K tholeiite series, through mid-K and high-K calc-alkaline series to shoshonite series and predominated samples are attributed to mid-K and high-K calc-alkaline series. Detailed analyses in Sr-Nd isotopic systematics and petrochemistry reveal that there may be regionally initial granitoid magma of the Indonisian granitoid plutons, comprising Dongjiangkou-Zhashui, Huayang-Wulong-Laocheng, Xiba, and Guangtoushan-Liuba granitoid plutons, which were produced by hybrids of magmas in various degrees, and the initial magmas were derived from both the mantle and the lower continental crust (LCC) sources in the SQTB. The initial granitoid magma further did the magma hybrid with the magmas from the LCC, crystallization fractionation, and assimilation with upper crustal materials during their emplacement to produce these granitoid plutons in the SQTB. These magmatism processes are most likely to occur under continent marginal arc and syn-collision to post-collision tectonic backgrounds. 相似文献
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Five volcanic rock samples and two granite samples taken from the volcanic basins in western Fujian and southern Jiangxi were dated by using the zircon laser albation-inductively coupled plasma mass spectrometry U-Pb method. Together with previously dated ages, the dates obtained provide important constraints on the timing of late Mesozoic tectonic events in SE China. The volcanic rock samples yield ages of 183.1±3.5 Ma, ca. 141 Ma to 135.8±1.1 Ma, 100.4±1.5 to 97.6±1.1 Ma, confirming three episodes of late Mesozoic volcanic activities, which peaked at 180±5 Ma, 140±5 Ma and 100±5 Ma, respectively, along the Wuyishan belt. Moreover, based on field investigations of these volcano-sedimentary basins, we have recognized two compressional tectonic events along this belt The early one was characterized by Upper Triassic to Middle Jurassic NNE-trending folds that were intruded by late Jurassic granites; and the late one caused the Lower Cretaceous volcano-sedimentary layer to be tilted. The dated age 152.911.4 Ma of the granitic samples from the Hetian granitic pluton in the Changting Basin and that from the Baishiding granitic pluton, 100.2±1.8 Ma, in the Jianning Basin, give the upper boundaries of these two tectonic events respectively. Hence, the late Mesozoic tectonic evolution of SE China was alternated between extension and compression. 相似文献
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本文中的构造主指断裂构造,条块是指不同断裂构造发育的一定地质单元或由断裂构造切割形成的地质单元.通过对东坪金矿区构造条块体系的具体分析,提出了一些成矿观点,同时进行了较具体的成矿预测,这对地质找矿提出了一个思路. 相似文献
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包钢巴润矿业分公司为安全快速完成高位通廊带式输送机换带工作,紧密结合输送机现场布置实际,通过理论计算分析,提出了一种全新的高位通廊输送机换带方法,依靠输送机驱动装置,辅助以工程车辆,低速运转输送机,利用旧带导出新带,喂入新带同时导出旧带,然后硫化胶接新带。 相似文献
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Seismotectonics in the Three Gorges reservoir area is investigated by using the P-wave tomography with earthquakes that occurred before the impoundment of the reservoir. The result indicates that most of these events occurred in or around the velocity-gradient belts between high-velocity and low-velocity anomalies.These belts have similar characteristics to buried-fault zones. Stresses generated by movement of partially molten upper-mantle materials and thermal stress may have jointly contributed to the seismic activities along the faults and such buried faults, and possibly activated new earthquake ruptures. 相似文献
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系统研究长距离、高带速、大型带式输送机输送带的服役寿命,找出影响其服役寿命的原因,提出延长其服役寿命的技术途径。 相似文献