DISCOVERY OF LATE MESOZOIC MAGMATIC ROCKS IN ORDOS ANCIENT CONTINENT NUCLEUS AND ITS GEOLOGICAL IMPLICATION
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摘要: 在古老、稳定的鄂尔多斯古陆核上, 经过初步的金刚石找矿工作发现了一些来自深源的金刚石指示矿物; 并在这些指示矿物异常区的源头, 发现了玄武质岩浆岩。这些深源岩浆主要呈弱的喷发或爆发形式或裂隙式贯入为表现特征。它的发现可以证明冀鲁辽古陆核在中生代强烈活化的同时, 鄂尔多斯古陆核也出现较弱的岩浆活动。它提供了一个研究大陆岩石圈的窗口, 同时对本地区的金刚石找矿可能具有指导意义。Abstract: In the ancient and stable Ordos continent nucleus, we found deep-seated indicator minerals diamond in a preliminary exploration, and basaltic magmatic rocks in the source area of anomaly of indicative of the minerals.This deep source magma mainly occurs as weak eruption or explosion, or fissure injection.This discovery reveals a weak magmatic activity in the Ordos ancient continent nucleus during the Mesozoic when Hebei-Shandong-Liaoning ancient continent nucleus was activating.It can not only provide a window for research on continental lithosphere, but also prove to be of great significance to the exploration of diamond in this area.
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Key words:
- Ordos /
- ancient continent nucleus /
- basaltic magma /
- volcano
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图 1 区域地质图及重砂异常区
1.第四纪风成砂、冲、洪、湖积; 2.上新世泥岩、泥岩夹钙质结核; 3.早白垩世砂岩、泥岩、砂质岩; 4.侏罗纪砂岩、泥岩、砂质夹煤层; 5.三叠纪砂砾岩夹泥岩及钙质结核; 6.太古代辉橄岩脉; 7.采样位置; 8.人工重砂位置; 9.新庙地区样点位置
Figure 1. Regional geological map showing heavy mineral concentrate anomaly area
图 2 重砂异常区及采样位置图
1.水系; 2.水系重砂点位及编号; 3.水系大样点位及编号; 4.人工重砂及编号; 5.铬尖晶石; 6.镁铝榴石; 7.金云母; 8.透辉石; 9.采样点位置; 10.金刚石指示矿物异常区
Figure 2. Sketch showing heavy mineral concentration anomaly and sample location
图 4 新庙地区熔岩中钙铁硅酸盐矿物包含钙长石
Figure 4. Ca-Fe silicate hosting calcic plagioclases in lava from Xinmiao area
表 1 异常区内主要矿物化学成分表
Table 1. Chemical compositions of main mineral in the anomaly area
表 2 岩石样品化学分析结果表
Table 2. Chemical compositions of rock samples
表 3 岩石样品化学分析对比表
Table 3. Comparison of chemical compositions of rock samples
表 4 岩石样品微量元素对比表
Table 4. Comparison of trace elements of rock samples
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