上白垩统(Turonian?)的地层结构与河流解释美国南卡罗来纳切斯特菲尔德县米登多夫地层

IF 2 4区 地球科学 Q1 GEOLOGY Journal of Sedimentary Research Pub Date : 2023-06-23 DOI:10.2110/jsr.2022.034
C. Swezey, Bradley A. Fitzwater, G. Whittecar
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Outcrops display the following five facies assemblages: 1) sandstone to conglomeratic sandstone (fluvial bar and channel deposits), 2) beds of alternating laminae of sandstone and mudstone (fluvial overbank or floodplain deposits), 3) ≥ 1 m-thick beds of clay (swamp deposits, floodplain deposits, and/or sediment that accumulated in abandoned fluvial channels), 4) 0.2–0.5 m-thick planar to slightly undulatory beds of framework-supported sandstone with a mud matrix (traction-dominated current deposits at the top of fluvial bars, upper-flow-regime bedform deposits in subsidiary fluvial channels, or coarse-grained overbank deposits), and 5) sandstone to conglomeratic sandstone cemented by iron (interpreted as fluvial bar and channel deposits, with the iron cement being a diagenetic “groundwater ferricrete” that formed via the circulation of shallow groundwater and the oxidation of iron-bearing minerals). 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引用次数: 0

摘要

上白垩纪(Turonian?)米登多夫组是一个富含砂的地层单元,起源于河流,在美国大西洋沿岸平原形成了一个大型含水层。在南卡罗莱纳切斯特菲尔德县(Chesterfield County, South Carolina),即该类型位置的所在地,地层厚度为66.5 ~ bb0 ~ 119.7 m。地层底部为古生代变质泥质上的不整合面,上部接触面为不整合面,其上为第四纪松木组砂体。露头显示出以下5种相组合:1)砂岩-砾岩砂岩(河流坝和河道沉积),2)砂岩-泥岩交替纹层(河流上滩或河漫滩沉积),3)厚度≥1 m的粘土层(沼泽沉积、河漫滩沉积和/或废弃河道中堆积的沉积物),4)厚度为0.2-0.5 m的平面至略带起伏的泥质框架支撑砂岩层(河流坝顶部以拖曳为主的水流沉积),5)由铁胶结的砂岩到砾岩砂岩(解释为河流坝和河道沉积,其中铁胶结物是通过浅层地下水循环和含铁矿物氧化形成的成岩“地下水铁铁矿”)。不同形态的高岭石在整个地层中普遍存在,被解释为在温暖湿润的古气候下,经过长期的沉积后风化和大气水冲刷而形成的早期成岩现象。形成米登多夫组的河流系统从中生代裂谷盆地和(或)阿巴拉契亚山脉的隆起边缘向西或向西北推进。这种进积是对基准面下降和基准面低洼和随后的早期海侵期间沉积的反应。在切斯特菲尔德县,米登多夫组可以细分为三个向上细化的层序。每个层序主要由中至粗砂组成,层序下部含较多砾石,上部含较多粘土和粉砂层。每个层序都被解释为对自生过程的响应或对异体海平面变化的响应,特别是从相对低水位条件到早期海侵的高阶(高频率)进展,在初始低水位条件下保存了粗砂和砾石(例如河流坝和河道沉积),在随后的早期海侵中保存了更大比例的泥和细粒砂(洪泛平原沉积)。米登多夫组与北美其他几个富含高岭石的河流砂岩相关,包括新泽西州的拉坦组、墨西哥湾东部(阿拉巴马州、密西西比州、路易斯安那州)的塔斯卡卢萨组、墨西哥湾中部(德克萨斯州)的伍德拜恩组和怀俄明州的边境组。这些地层的聚集和保存是对Turonian期海平面上升下降和随后的海侵的响应,这些地层中的早成岩高岭石归因于类似的温暖湿润的古气候条件。
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Stratigraphic architecture and fluvial interpretations of the Upper Cretaceous (Turonian?) Middendorf Formation, Chesterfield County, South Carolina, U.S.A.
The Upper Cretaceous (Turonian?) Middendorf Formation is a sand-rich stratigraphic unit of fluvial origin that forms a large aquifer in the U.S. Atlantic Coastal Plain. In Chesterfield County (South Carolina), which is the site of the type locality, the formation ranges in thickness from 66.5 to > 119.7 meters. The base of the formation is an unconformity above Paleozoic metasiltstone, and the upper contact is an unconformity above which lies sand of the Quaternary Pinehurst Formation. Outcrops display the following five facies assemblages: 1) sandstone to conglomeratic sandstone (fluvial bar and channel deposits), 2) beds of alternating laminae of sandstone and mudstone (fluvial overbank or floodplain deposits), 3) ≥ 1 m-thick beds of clay (swamp deposits, floodplain deposits, and/or sediment that accumulated in abandoned fluvial channels), 4) 0.2–0.5 m-thick planar to slightly undulatory beds of framework-supported sandstone with a mud matrix (traction-dominated current deposits at the top of fluvial bars, upper-flow-regime bedform deposits in subsidiary fluvial channels, or coarse-grained overbank deposits), and 5) sandstone to conglomeratic sandstone cemented by iron (interpreted as fluvial bar and channel deposits, with the iron cement being a diagenetic “groundwater ferricrete” that formed via the circulation of shallow groundwater and the oxidation of iron-bearing minerals). Kaolinite in various forms is pervasive throughout the formation and is interpreted as an early diagenetic phenomenon that formed by prolonged postdepositional weathering and flushing by meteoric water under a warm and humid paleoclimate. The fluvial system that formed the Middendorf Formation prograded into the area from the west or northwest from uplifted margins of Mesozoic rift basins and/or the Appalachian Mountains. This progradation was a response to a base-level fall and the sediment accumulated during base-level lowstand and subsequent early transgression. In Chesterfield County, the Middendorf Formation can be subdivided into three fining-upward sequences. Each sequence consists predominantly of medium to coarse sand with a greater abundance of gravel in the lower part of the sequence and a greater abundance of clay and silt beds in the upper part. Each sequence is interpreted as either a response to autogenic processes or a response to allogenic sea-level changes, specifically a higher-order (higher-frequency) progression from relative lowstand conditions to early transgression whereby coarse sand and gravel (e.g., fluvial bar and channel deposits) were preserved during initial lowstand conditions and a greater proportion of mud and finer-grained sand (floodplain deposits) were preserved during subsequent early transgression. The Middendorf Formation is correlative with several other kaolinite-rich fluvial sandstones in North America including the Raritan Formation in New Jersey, the Tuscaloosa Formation of the eastern Gulf of Mexico (Alabama, Mississippi, Louisiana), the Woodbine Formation of the central Gulf of Mexico (Texas), and the Frontier Formation of Wyoming. The accumulation and preservation of these formations occurred in response to a Turonian eustatic sea-level fall and subsequent transgression, and the early diagenetic kaolinite in these formations is attributed to similar warm and humid paleoclimate conditions.
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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