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曹荣龙 《矿物岩石地球化学通报》1986,(2)
1.地球科学的方法论问题:(1)“将今论古”:板块学说的基本概念正确地揭示了今日全球构造运动的实际,从而使“将今论古”的方法获得了前所未有的明确含意。从这个意上说,当今研究地球科学的学术指导思想须推崇板块学说。要把板块学说的理论与中国地质的实际结合起来,在方法论上应采取“将今论古”来研究显生宙的古构造。现举两个例子来说明。 相似文献
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地幔流体的前缘研究 总被引:19,自引:8,他引:19
地幔流体是与地幔环境处于平衡的气体和挥发分。其主要化学组分为碳、氢、氧、氮、硫(CHONS)。它以富于地球内部原始组分为特征,但也包含部分再循环组分。地幔挥发分在弱还原条件下主要为CO2-H2O,强还原环境则以CH4-H2O-H2为主。地幔流体地球化学的重要性质为:(1)易溶于硅酸盐熔体;(2)净化作用;(3)再沉淀作用。近年来,有关地幔流体中稀有气体和挥发分的起源、分布及同位素组成等前缘领域的研究已取得重要进展。当前拟优先探索的问题包括气体裂化与金刚石成因,非生物成因地幔烃,地幔流体与成矿作用,以及地幔挥发分注入与地壳重熔等。 相似文献
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曹荣龙 《矿物岩石地球化学通报》1985,(2)
自从对塞浦路斯特罗多斯蛇绿岩的传统成因见解提出异议以来,蛇绿岩的成因判别问题引起了广泛的重视。对于西藏雅鲁藏布江蛇绿岩来说,同样存在着大洋蛇绿岩以及岛弧蛇绿岩两种不同的成因观点。根据该岩带中段拉孜—日喀则蛇绿岩的研究,笔者相信它应代表洋区蛇绿岩,形成于古地中海的扩张脊。现就成因判别的地质地球化学证据论述如下。 相似文献
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基于高分辨率遥感影像的设施农业资源信息采集技术研究 总被引:1,自引:0,他引:1
结合设施农业空间位置分布规律及其在高分辨率遥感影像上的纹理特征体现,设计了批量设施自动生成算法,并基于GIS组件开发了基于高分辨率遥感影像的设施农业信息采集系统;该系统以高分辨率遥感影像为基础底图,结合批量设施自动生成算法进行数字化,实现了人机交互式半自动化信息采集。 相似文献
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新疆北部蛇绿岩及基性-超基性杂岩 总被引:10,自引:0,他引:10
新疆北部蛇绿岩及基性-超基性杂岩曹荣龙(中国科学院广州地质新技术研究所,广州510640)(GuangzhouInstituteofGeologyandNew,Technology,CAAS)在某些文献中常将新疆蛇绿岩及基性一超基性杂岩统称蛇绿岩。笔... 相似文献
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西藏雅鲁藏布江蛇绿岩带和深海沟沉积物的岩石学特征及其地质意义 总被引:1,自引:0,他引:1
A typical section of ophiolite at Tangga in Lhaze district shows the sequential association of ophiolite from north to south as follows: basal tectonized harzhurgitc,altered basalt, and red radiolarian chert. The ophiolites, late Cretaceous in age, arelithologically similar to the current models of oceanic crust and upper mantle, representing the slice of Tethys ocean basin. At Chongdui, about 20 km southeast of Xigaze, a thick sequence of trench turbidite is recognized associated with pillow lava and submarine volcanic conglomerate. The trench turbidite is well. layered with a suit of rhythmical deposits of graded bedding.The coarse-grained ophiolitic greywacke is generally at the base of each rhythm and gives its way upward to the gabbroid greywacke and finer material, while the chert and volcanic tuff rest at the top, showing good rhythmic pattern of Bouma cycle.Because it has not been documented before.it is named “the Chongdui Formation”after the place. It is also late Cretaceous in age. At the same place it is found that the basal serpentinite overthrusts northwards on the trench turbidite. There, the basal ultramafic rock dips southwards in contrast to the northward dipping of the turbidites, showing thrust drag at contact. Because the trench sediments mark the margin of Eurasia continent, it is suggested that the ophiolites are emplaced tectonically along the suture zone where Indian continent and Eruasia continent are welded together. A four-stage model is proposed to expblin the plate history for Himalayan geology. 相似文献