犹他州埃默里和塞维尔县Mancos页岩中埃默里砂岩段的沉积学和沉积环境

J. P. Matheny, M. Picard
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引用次数: 9

摘要

本文介绍了犹他州城堡谷南部上白垩统曼科斯页岩中金刚砂砂岩段的沉积学研究结果。确定了沉积环境、古地理、结构和矿物学特征以及可能的沉积物来源。潮滩矿床在金刚砂中占主导地位,但潮下(滨面)和近海也有矿床。古潮差估计在1.3 ~ 1.7 m之间,存在两种不同幅度和周期的不对称海侵退流旋回。它们是在海平面的轻微波动和沉降速率的轻微变化下形成的。砂砂岩沉积于塞维尔造山带的前陆。根据古洋流分析,古海岸线的平均方向为北9”西,沉积物可能是被海岸洋流从犹他州-爱达荷州-怀俄明州的边界地区向南移动的。在金刚砂中,分选良好、次圆到次角、粒度非常细的亚粗砂岩是主要的岩石类型,白云岩和钙石是主要的胶结物,根据薄片分析,平均孔隙度小于2%。丰富的燧石颗粒和改造后的自生石英覆生表明其为沉积源地。观测到的长石数量可能来自于暴露在塞维尔造山带的中中生代沉积岩
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sedimentology and Depositional Environments of the Emery Sandstone Member of the Mancos Shale, Emery and Sevier Counties, Utah
Results of a sedimentological study of the Emery Sandstone Member of the Mancos Shale (Upper Cre- taceous) in southern Castle Valley, Utah, are presented. Depositional environments, paleogeography, textural and mineralogrcal characteristics and possible sediment sources are determined. Tidal flat deposits are dominant in the Emery, but subtidal (shoreface) and offshore deposits also occur. The paleotidal range is estimated to have been between 1 3 and 1.7 m Many asymmetrrc, transgressive-regres- srve cycles of two drfferent magnitudes and periods are present. They formed in response to minor fluctua-tions in sea level combrned wrth slight varrations m the subsidence rate. The Emery Sandstone was deposited m the foreland of the Sevier orogenic belt. The average orientatron of the paleoshoreline, as determrned by paleocurrent analysis, was N. 9" W. Sediment was probably transported southward from the Utah-Idaho- Wyomrng border area by longshore currents. Well-sorted, subrounded to subangular, very fme-grained subarkose is the dominant rock type in the Emery Dolomite and calcrte are the major cements Average porositres, based on thin sectron analysis, are less than 2 percent. Abundant chert grains and reworked authigenrc quartz overgrowths suggest a sedimentary source terrain. The observed amounts of feldspar could have been derived from Mesozorc sedimentary rocks exposed in the Sevier orogenrc belt
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