Mineralogical Trends in Upper Paleocene-Lower Eocene Sediments of the Gulf Basin and Southern Rocky Mountains: Test for Synchroneity between Source Area Uplift and.....

初步分析了新墨西哥湾西北部两个大型碎屑楔(Wilcox群和下Claiborne群)以及南落基山脉拉莱姆盆地上古新世-下始新世地层中矿物学随时间的变化趋势，认为Chapin和Cather(1983)所描述的拉拉米勒造山作用的两期隆升历史可能是由碎屑矿物学记录的。成分的时间变化也表明气候变化对碎屑矿物学的演化起到了作用。建议研究墨西哥湾盆地西北部Wilcox群和Low Claiborne群的碎屑和成岩矿物学的时间变化，以及南落基山脉拉拉米德盆地的同时代沉积。这些信息将检验这样一种理论，即陆内拉莱姆构造作用的脉冲是通过墨西哥湾盆地的三角洲-楔形进积事件记录下来的。特别是，我们将解决这样一个问题：三角洲增长的响应在地质上是瞬时的，还是在内部隆起附近的盆地充填和大陆边缘伴生沉积物的沉积之间存在地质上的显著滞后时间？样品间隔的孢粉分析将把矿物学变化的趋势置于一个时间框架内。这种受时间限制的矿物学变化分析将使我们能够评估大陆内部造山作用和大陆边缘沉积作用之间的同步性。

Preliminary analysis of mineralogical trends through time in two large clastic wedges in the northwestern Gulf of New Mexico Basin (Wilcox and lower Claiborne Groups), and time-equivalent upper Paleocene-lower Eocene strata in Laramide basins of the Southern Rocky Mountains, suggests that the two-phase uplift history of Laramide orogeny described by Chapin and Cather (1983) may be recorded by detrital mineralogy. Temporal changes in composition also indicate that changing climate played a role in the evolution detrital mineralogy. The proposal is to study the temporal changes of detrital and diagenetic mineralogy in the Wilcox and lower Claiborne Groups of the northwestern Gulf of Mexico Basin, and coeval sediments in Laramide basins of the Southern Rocky Mountains. This information will provide a test of the theory that pulses of intracontinental Laramide tectonism are recorded by episodes of deltaic-wedge progradation in the Gulf of Mexico Basin. In particular, we will address the question: Is the response of delta growth geologically instantaneous, or does a geologically significant lag-time exist between filling of basins adjacent to interior uplifts and the deposition of associated sediment at the continental margin? Palynological analysis of sample intervals will place the trend of mineralogical changes within a time framework. This temporally constrained analysis of mineralogical changes will allow an assessment of synchroneity between interior-continental orogeny and continental-margin sedimentation.