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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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海南岛白垩纪古地磁结果及其构造地质意义
, PP. 183-194
Keywords: 海南岛,白垩纪,古地磁,构造意义
Abstract:
对海南岛地区白垩纪鹿母湾组和报万组碎屑岩219个独立定向样品（29个采点）的岩石磁学和古地磁学研究表明，白垩纪的碎屑岩以赤铁矿为主要载磁矿物。逐步热退磁分析表明，绝大多数样品可分离出特征剩磁分量。综合前人的结果，获早白垩世特征剩磁方向D=6.5°，I=42.7°,κ=73.4，α95=8.2°；晚白垩世特征剩磁方向D=6.7°，I=44.7°，κ=125.5，α95=5.4°。其早白垩世古纬度24.8°(+6.2°/-5.8°)，晚白垩世古纬度26.3°(+4.6°/-4.0°）；均位于现在地理位置以北约5-6°。与华南板块东南缘白垩纪的古地磁数据对比表明，晚白垩世海南地块仍是华南板块的一部分。海南岛白沙断裂东西两侧早白垩世古地磁数据的差异，表明存在一个北东向的构造走滑带，白沙断裂可能是华南沿海北东向构造带的南延部分。海南岛白垩纪古地磁结果也表明，相对印支地块，海南岛在早白垩世时发生了25°左右局部顺时针旋转。推测此局部旋转很可能与晚侏罗世-晚白垩世早期，印度洋开始第一次海底扩张，印度板块向北运动有关。
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