气候变化领域集成服务门户(CCPortal): Diagenetic to incipient metamorphic zones of the benton uplift, ouachita orogen, arkansas, USA

CCPortal

DOI	10.1130/B35174.1
	Diagenetic to incipient metamorphic zones of the benton uplift, ouachita orogen, arkansas, USA
	Johnson H.E.; Wiltschko D.V.; Harris J.P.
发表日期	2020
ISSN	167606
起始页码	977
结束页码	986
卷号	132 期号:2021-05-06
英文摘要	Vitrinite reflectance analysis and the mean diameter of metamorphosed quartz, suggest that the eastern Ouachita region, Arkansas, USA reached the lower greenschist facies, regardless of burial depth. An increase in "crystallinity" may explain that the maturation is from the exhumation of the rocks from a greater depth. Shale and sandstone samples collected from outcrops along the crest of the Benton Uplift exhibit illite and chlorite crystallinities that yield higher indices compared to younger rocks adjacent to this crustal-scale anticlinal structure. Illite crystallinity d(001) of air-dried, fine (<0.2 μm) authigenic clays (Δ°2Θ (CuKα) = 0.417° to 0.875°) yield a range of conditions from diagenetic temperature to lower anchizone temperatures up to-200 °C. Air-dried, fine authigenic chlorite clays (Δ°2Θ (CuKα) = 0.259° to 1.570°) yield a wide range of diagenetic to metamorphic conditions that span the diagenetic zone through epizone, which indicate a maximum temperature slightly above-300 °C. These results are in contrast to prior thermal maturation data. No additional heat sources, such as from pluton emplacement, were identified by major areas of anomalous high maturation based on crystallinity. Regionally, the illite and chlorite crystallinity increases toward the central axis of the Benton Uplift. Exhumation of the rocks from greater depth is all that is required to explain the illite and chlorite crystallinity data. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184784
作者单位	Center for Tectonophysics, Department of Geology and Geophysics, Texas A and M University, 3115 TAMU, College Station, TX 77843, United States; Sam Houston State University, Department of Geography and Geology, P.O. Box 2148, Huntsville, TX 77341, United States
推荐引用方式 GB/T 7714	Johnson H.E.,Wiltschko D.V.,Harris J.P.. Diagenetic to incipient metamorphic zones of the benton uplift, ouachita orogen, arkansas, USA[J],2020,132(2021-05-06).
APA	Johnson H.E.,Wiltschko D.V.,&Harris J.P..(2020).Diagenetic to incipient metamorphic zones of the benton uplift, ouachita orogen, arkansas, USA.Bulletin of the Geological Society of America,132(2021-05-06).
MLA	Johnson H.E.,et al."Diagenetic to incipient metamorphic zones of the benton uplift, ouachita orogen, arkansas, USA".Bulletin of the Geological Society of America 132.2021-05-06(2020).