Testing the Relative Roles of Tectonics and Eustacy for the Origin of Middle Pennsylvanian Cyclothems in Southern Oklahoma Using Biostratigraphy and Sedimentology

利用生物地层学和沉积学测试构造和地层对俄克拉荷马州南部中宾夕法尼亚旋回层起源的相对作用

• 批准号: 9019030
• 负责人: R. Douglas Elmore
• 金额: $ 7.8万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019030&HistoricalAwards=false
• 关键词: Testing; Relative; Roles; Tectonics; Eustacy

The objective of the proposed research is to constrain the relative roles of eustacy and tectonics for the origins of Pennsylvanian cyclothems by testing how the cyclothem pattern and timing in a basin directly influenced by uplift compares with the pattern and timing of eustatic cyclothems. The Desmoinesian interval in the Ardmore Basin in southern Oklahoma contains progradational sequences separated by transgressive deposits. Based on the abrupt introduction of detrital chert, a change in paleocurrent directions, and the facies patterns, we suggest that this interval was directly influenced by tectonic activity in the Ouachita fold and thrust belt. Development of a relative sea level curve for this interval based on a genetic stratigraphic sequence approach and biostratigraphic calibration of the curve will allow a comparison with a eustatic curve from the Midcontinent based on fusulinids, and will refine and test this correlation based on studies of conodonts and other fossil groups where present. We have a good stratigraphic framework for most of the interval based on outcrop studies. Additional sedimentologic and stratigraphic studies of both outcrops and subsurface sections will be integrated to develop the genetic stratigraphic sequences.

拟议研究的目的是限制 海平面上升和构造运动对 宾夕法尼亚旋回层通过测试如何旋回层模式和 在一个盆地中，直接受隆起影响的时间与 海平面旋回层的模式和时间。 德梅因学派 俄克拉荷马州南部阿德莫尔盆地的间隔包含 海侵沉积物分隔的跨洋层序。 基于碎屑燧石的突然引入， 古水流方向和相模式，我们认为， 这段时间直接受到了 沃希托褶皱冲断带。 相对海平面的发展 基于成因地层序列的这段时间的曲线 曲线的方法和生物地层学校准将允许 与中大陆海平面变化曲线的比较， fusulinids，并将完善和测试这种相关性的基础上， 牙形刺和其他化石群的研究。 我们 在大部分基于 进行露头研究 其他沉积学和地层学 对露头和地下剖面的研究将被整合 建立成因地层序列。