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浅论新疆海相火山热水沉积矿床的分带及其找矿意义 总被引:9,自引:0,他引:9
新疆海相火山热水沉积矿床,一般在时间上没有明显的集中生长期。空间上依附于活动大陆边缘火山岛弧带,它在区域上和矿床本身具有矿种转化、类型转换、配套与分带特征。以块状氧化物、块状碳酸盐和块状硫化物转换序次来研究该类矿床。利用铁木尔特铅锌矿上部铅锌下部铜金,预须开普台铁矿上铁下铜;莫托沙拉铁锰矿上锰下铁中间铅锌重晶石等矿种转化规律和由块状氧化物和块状碳酸盐向块状硫化物成生过渡特点,预测诸如蒙库铁矿、赤龙峰火山盆地中铁矿和喀喇昆仑山各铁矿床(点)外围与深部转换、发展成为铜金矿的成矿前景。 相似文献
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The coral reefs in Bermuda's Castle Harbour basin have been subjected to varying anthropogenic stressors for over 100 years. These include restriction of water flow through the construction of a causeway in the late 19th century and an extensive dredging and land reclamation operation during World War II. In the 1970s, disposal of bulk waste commenced at a foreshore reclamation site in Castle Harbour. Since 1996 the waste stream has included blocks of cement-stabilized municipal incinerator ash. This study provides a historical and quantitative ecological review of the Castle Habour reef ecosystem as a case study, assessing the responses of the reef to more than a century of anthropogenic disturbance. Measures of the coral community, flow rates, turbidity and sedimentary regimes suggest the present structure of the coral community largely reflects the impacts of the historic dredge and fill operations prior to the establishment of the foreshore dump site. Recent increases in the abundance of some sediment tolerant, massive reef-building coral species (Diploria strigosa and Montastraea cavernosa) suggest adaptation to chronic sediment stress. 相似文献
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新疆北部主要矿产成矿规律田培仁(中国有色金属工业总公司新疆地质勘查局地质研究所,乌鲁木齐830000)(GeologicalInstituteofXinjiangGeologicalProspectingBureau,GeneralCompanyof... 相似文献
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伊犁亚板块是自元古代发展起来的一个不同时期的裂谷带,被NE和NW向两组构造线左右,及海西期NWW、NNE和SN向构造叠加,构成伊犁亚板块格状、菱格状构造格架。区域主要金属矿产具有明显时空分布特点,受控于时代、岩性、构造和岩浆岩,并分出海相和陆相两个生成系列,对该区主要矿带作了划分,推荐了区域有望找矿靶区。 相似文献