• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of African Earth Sciences >The C2 and C3 formations of the Schisto-Calcaire Subgroup (West Congo Supergroup) in the Democratic Republic of the Congo: An example of post-Marinoan sea-level fluctuations as a result of extensional tectonisms
【24h】

The C2 and C3 formations of the Schisto-Calcaire Subgroup (West Congo Supergroup) in the Democratic Republic of the Congo: An example of post-Marinoan sea-level fluctuations as a result of extensional tectonisms

机译：刚果民主共和国血吸虫-Calcaire子群（西刚果超群）的C2和C3形成：以扩张构造为后马里诺斯海平面波动的一个例子

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

In the Lower Congo region, the Ediacaran Schisto-Calcaire Subgroup consists of five carbonate-dominated formations (Cl to C5). They record tectono-eustatic sea-level fluctuations controlled by several short-time extensional tectonic events occurred in the whole basin, followed by the development of the Aracuai-West Congo Orogen between 630 Ma and 560 Ma. The uppermost units of the C2 Formation, i.e. C2d and C2e members, consist of open marine to peritidal/sabkha cycles of 1-4 m in thickness formed during in a Highstand Systems Tract (HST). The unexposed transition between the C2 and C3 formations is interpreted as a 'final' HSTphase which initiated the burial of the carbonate ramp by prograding siliciclastics or an early Transgressive Systems Tract (TST) phase. The carbonates of the C3 Formation represent open marine shallowing-upward cycles of 3-8 m in thickness, with deposition at the top of massive oolitic barrier shoals during a TST which flooded the entire the Neoproterozoic West Congo Basin. During the highstand, contributions of river water and land-derived material inputs occured, intermittently according to the semi-arid to arid conditions that prevailed in the restricted inner ramp and in the sabkha facies belts.
机译：在刚果（金）下部地区，埃迪卡拉an史密斯-卡萨尔气溶胶亚组由五个碳酸盐为主的岩层（C1至C5）组成。他们记录了整个盆地发生的几次短时间伸展构造事件控制的构造-静态海平面涨落，然后在630 Ma至560 Ma之间发育了Aracuai-West Congo造山带。 C2地层的最上层单元，即C2d和C2e单元，由在海床系统道（HST）期间形成的厚度为1-4 m的开放海相到围岩/沙巴卡循环组成。 C2和C3地层之间未暴露的过渡被解释为“最终” HST相，该相通过推进硅质碎屑或早期海侵体系（TST）相开始埋藏碳酸盐岩斜坡。 C3组的碳酸盐岩代表着厚度为3-8 m的开放海洋浅层向上旋回，在TST期间沉积在大规模的橄榄岩屏障浅滩顶部，整个新元古代的西刚果盆地都被淹没了。在高潮期，根据受限制的内部斜坡和萨布卡岩相带中普遍存在的半干旱至干旱条件，间歇性地发生了河水和陆源物质输入的贡献。

著录项

相似文献

  • 外文文献
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