层序地层学-英语.doc
《层序地层学-英语.doc》由会员分享,可在线阅读,更多相关《层序地层学-英语.doc(2页珍藏版)》请在文库网上搜索。
1、Basic terms of Sequence StratigraphyAccommodation. Another term for relative sea-level. Can be thought of as the space in which sediments can fill, defined at its base by the top of the lithosphere and at its top by the ocean surface. Eustatic Sea Level. Global sea level, which changes in response t
2、o changes in the volume of ocean water and the volume of ocean basins. Highstand Systems Tract. Systems tract overlying a maximum flooding surface, overlain by a sequence boundary, and characterized by an aggradational to progradational parasequence set.Lowstand Systems Tract. Systems tract overlyin
3、g a type 1 sequence boundary, overlain by a transgressive surface, and characterized by a progradational to aggradational parasequence set. Marine Flooding Surface. Surface separating younger from older strata, across which there is evidence of an abrupt increase in water depth. Surface may also dis
4、play evidence of minor submarine erosion. Forms in response to an increase in water depth.Parasequence. Relatively conformable (that is, containing no major unconformities), genetically related succession of beds or bedsets bounded by marine-flooding surfaces or their correlative surfaces. Paraseque
5、nces are typically shallowing-upward cycles. Parasequence Set. Succession of genetically related parasequences that form a distinctive stacking pattern, and typically bounded by major marine flooding surfaces and their correlative surfaces. Parasequence set boundaries may coincide with sequence boun
6、daries in some cases. See progradational, aggradational and retrogradational parasequence sets.Relative Sea Level. The local sum of global sea level and tectonic subsidence. Locally, a rise in eustatic sea level and an increase in subsidence rates will have the same effect on accommodation. Likewise
7、, a fall in eustatic sea level and tectonic uplift will have the same effect on accommodation. Because of the extreme difficulty in teasing apart the effects of tectonic subsidence and eustatic sea level in regional or local studies, sequence stratigraphy now generally emphasizes relative changes in
8、 sea level, as opposed to its earlier emphasis on eustatic sea level. Sequence. Relatively conformable (that is, containing no major unconformities), genetically related succession of strata bounded by unconformities or their correlative conformities. Sequence Stratigraphy. The study of genetically
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 地层学 英语