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

新墨西哥盆地西北部两个大型碎屑楔块（Wilcox群和下Claiborne群）和南落基山脉Laramide盆地上古新世-下始新世地层时间等效矿物学趋势的初步分析表明Chapin和Cather（1983）所描述的Laramide造山运动的两期隆升史可能由碎屑矿物学记录。组成的时间变化也表明气候变化对碎屑矿物学的演化起了一定的作用。拟研究墨西哥湾盆地西北部Wilcox和下Claiborne群的碎屑岩矿物学和成岩矿物学的时间变化，以及南落基山脉Laramide盆地的同时期沉积物。这一信息将对墨西哥湾盆地三角洲-楔块进积期记录大陆内拉拉米构造运动脉冲的理论进行检验。特别是，我们将解决以下问题：三角洲生长的反应在地质上是瞬时的，还是在内陆隆起附近盆地的填充与大陆边缘相关沉积物的沉积之间存在地质上显著的滞后时间？对样品间隔的孢粉学分析将把矿物学变化的趋势置于一个时间框架内。这种对矿物学变化的时间限制分析将有助于评估大陆内部造山运动和大陆边缘沉积之间的共时性。

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.