...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Isotopic evidence (B, C, O) of deep fluid processes in fault rocks from the active Woodlark Basin detachment zone
【24h】

Isotopic evidence (B, C, O) of deep fluid processes in fault rocks from the active Woodlark Basin detachment zone

机译：活跃的伍德拉克盆地脱离带断层岩石中深部流体过程的同位素证据（B，C，O）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report results from boron, carbon and oxygen stable isotope analyses of faulted and veined rocks recovered by scientific ocean drilling during ODP Leg 180 in the western Woodlark Basin, off Papua New Guinea. In this area of active continental extension, crustal break-up and incipient seafloor spreading, a shallow-dipping, seismically active detachment fault accommodates strain, defining a zone of mylonites and cataclasites, vein formation and fluid infiltration. Syntectonic microstructures and vein-fill mineralogy suggest frictional heating during slip during extension and exhumation of Moresby Seamount. Low carbon and oxygen isotope ratios of calcite veins indicate precipitation from hydrothermal fluids (δ~(13)C_(PDB) down to -17‰; δ~(18)O_(PDB) down to -22‰) formed by both dehydration and decarbonation. Boron contents are low (<7 ppm), indicating high-grade metamorphic source rock for the fluids. Some of the δ~(11)B signatures (17-35‰; parent solutions to calcite vein fills) are low when compared to deep-seated waters in other tectonic environments, likely reflecting preferential loss of ~(11)B during low-grade metamorphism at depth. Pervasive devolatilization and flux of CO_2-rich fluids are evident from similar vein cement geochemistry in the detachment fault zone and splays further updip. Multiple rupture-and-healing history of the veins suggests that precipitation may be an important player in fluid pressure evolution and, hence, seismogenic fault movement.
机译：我们报告了通过科学海洋钻探在巴布亚新几内亚西部伍德拉克盆地的ODP Leg 180期间通过科学海洋钻探获得的断裂和脉状岩石的硼，碳和氧稳定同位素分析结果。在这一活跃的大陆扩张，地壳破裂和海床初期扩展的区域中，一个浅倾的，地震活动的脱离断层容纳了应变，从而定义了一个lon石岩和白云岩，静脉形成和流体渗透的区域。构造微观结构和脉状矿物学表明，在莫尔斯比海山的延伸和掘出过程中，滑移过程中摩擦加热。方解石脉的低碳氧同位素比表明由脱水和水热形成的热液（δ〜（13）C_（PDB）低至-17‰;δ〜（18）O_（PDB）低至-22‰）形成的沉淀。脱碳。硼含量低（<7 ppm），表明该流体属于高级变质烃源岩。与其他构造环境中的深部水域相比，某些δ〜（11）B签名（17-35‰;方解石脉填充的母体溶液）低，这可能反映了低位时〜（11）B的优先损失。深度变质。分离断层带中类似的脉状胶结地球化学表明，富CO_2流体的普遍挥发和通量很明显，且展布进一步倾覆。静脉的多次破裂和愈合历史表明，降水可能是流体压力演变以及因此引起地震的断层运动的重要因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号