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四川龙门山南段铜镍矿成矿地质特征及资源潜力研究
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摘要
研究区位于都江堰市灌口以南宝山县与芦山县交界处横跨盆地北西缘和盆周山地南西缘中段,构造上该区位于龙门山褶皱带南段,受次级构造单元“宝兴复背斜”控制,构造控制方向为北东--南西向。“宝兴复背斜”核心地层为前震旦系变质岩及宝兴杂岩组成,构造两翼为古生界、中生界时代的地层组成,次级断裂构造活动十分发育,构造-岩浆活动与成矿作用关系密切。自二十世纪八十年代以来,随着基础地质工作的全面展开,研究内不断获得新的突破,如发现中元古界黄水河群的基性岩以及黄铜尖子铜矿点含矿围岩中有大量铜镍矿化说明该区有良好的铜镍矿找矿远景。
     本次研究在成矿理论和地球动力学的指导下对研究区内的铜镍矿开展研究工作,研究中广泛搜集区内以往地、物、化、遥及矿产勘查等基础资料,通过综合分析对研究区铜镍矿资源开展科学的研究和评价,对龙门山南段铜、镍等矿产资源潜力开展深入的研究,为区内远景靶区预测和成矿理论研究奠定了基石出。
     龙门山南段具有良好的成铜镍矿地质和地球化学背景,区域内发现多处矿点和矿化点。根据区内成矿地质条件、已知矿产分布和矿床成因类型及物化探异常,在研究区内共圈定出与基性、超基性岩有关的铜、镍矿远景区,自北东向南西依次为芦山白铜尖子铜矿成矿远景区、芦山黄铜尖子铜镍成矿远景区、宝兴天主堂铜镍成矿远景区、太平铅锌成矿远景区和芦山火石崖铜镍异常区等4个成矿潜力好的区域,并发现十余处矿点及矿化点,发现了过去曾经被认为属“含铜黄铁矿型铜矿化”均产于黄水河群的绿色变质岩系中的理论;经实地勘察和深入研究发现含矿的角闪岩原岩为基性—超基性岩,这些铜矿化均伴有不同程度的镍矿化,因此本文将从变质原岩恢复及深部找矿入手全面深入的挖掘研究铜镍矿床的成因,区内主要类型为“黄铜尖子”铜矿、“白白铜尖子”铜(镍)矿,其次为“天主堂”铜(含铂族)矿,根据成铜(镍)地质和地球化学背景,区内在岩浆型铜(镍)硫化物矿床找矿上还具有良好的成矿潜力。
Study area south of the mouth located in Dujiangyan irrigation Lushan County, Baoshan County and across the junction of the north western margin of the basin and Basin southwest edge of the middle of the mountain, construction area is located on the southern section of the Longmen Shan fold belt, constructed by the sub-unit "Baoxing complex anticline "control, construction control direction NE-SW direction."Baoxing anticlinorium" core formation for the pre-Sinian metamorphic rocks and Baoxing complex, constructed wings for the Paleozoic, Mesozoic stratigraphic age composition, activities are well developed secondary faults, tectonic-magmatic activity and mineralization are closely related. Since the1980s, along with basic geological work in full swing, the study continue to receive a new breakthrough, such as found in Yellow River Middle Proterozoic mafic group of top brass and copper ore-bearing rock in the point a large number of copper-nickel mineralization in the area have a good description of copper-nickel ore exploration vision.
     In the mineralization of this study under the guidance of theory and geodynamics of the study area copper-nickel mine to carry out research work, the study collected extensive area in the past, the materials, technology, remote and mineral exploration and other basic information, through a comprehensive analysis copper-nickel mine on the study area resources to carry out scientific research and evaluation, the southern section of the Longmen copper, nickel and other mineral resource potential of in-depth study of long-term target forecast for the region and laid the foundation for forming theory.
     Longmen Mountains into the southern section has a good geological and geochemical copper-nickel mining background, found that many mine sites within the region and mineralization. According to local geological conditions, the known distribution and genesis of mineral types and geophysical and geochemical anomalies in the study area were delineated and basic, ultrabasic rocks for copper, nickel prospect, from north east to the southwest followed by copper-nickel alloy top copper mineralization prospects Lushan area, top brass, copper-nickel mineralization Lushan prospective areas, Baoxing Church copper-nickel mineralization prospect, lead and zinc ore prospect area and the Pacific Lushan fire cliffs and other4copper-nickel anomalies mineralization potential of a good area, and found more than ten points and mineralization at the mine, discovered in the past had been considered to be "copper-pyrite-type copper-based" groups are produced in the yellow River in the green metamorphic rocks theory; by field survey and in-depth study of ore-bearing amphibolite protolith mafic-ultramafic rocks, which are associated with different levels of copper nickel mineralization, this article from the metamorphic rocks to restore the original look and deep ore mining to start in-depth study of the causes of copper-nickel deposits, the main types of the region as a "top brass" copper,"copper-top vain," copper (Ni) deposit, followed by "Church" of copper (including PGE) deposit, according to copper (Ni) geological and geochemical background of the region in the magmatic Cu-(Ni) sulfide ore deposit, ore still has good potential.
引文
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