Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35060.1 |
Radiogenic isotope chemostratigraphy reveals marine and nonmarine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada | |
Gibson, Timothy M.1,3; Worndle, Sarah1; Crockford, Peter W.1,4,5; Bui, T. Hao1; Creaser, Robert A.2; Halverson, Galen P.1 | |
2019-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
![]() |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1965-1978 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA; Israel |
英文摘要 | The ca. 1050 Ma Bylot Supergroup in Arctic Canada is one of the best-preserved archives of late Mesoproterozoic geochemistry and biology and offers evidence that this period of Earth history may have been more biogeochemically dynamic than previously appreciated. The Bylot Supergroup was deposited in the Borden Basin and is the most thoroughly studied stratigraphic succession from a series of broadly contemporaneous late Mesoproterozoic intracratonic basins known as the Bylot basins. This similar to 6-km-thick mixed carbonate-siliciclastic succession has undergone minimal postdepositional deformation and is now exposed on Baffin and Bylot Islands, Nunavut, Canada. Deep-water and tidally influenced carbonate facies, traditionally interpreted as marine, have yielded important insights into the evolution of Proterozoic seawater chemistry; however, more recent studies indicate that the Borden Basin was restricted marine or lacustrine for portions of its depositional history. Here, we present new multiproxy radiogenic isotope chemostratigraphic data spanning the Bylot Supergroup. A comparison of stratigraphic trends in radiogenic isotope data from hydrogenous (black shale (OS)-O-187/Os-188 and limestone Sr-87/Sr-86) and detrital (whole-rock mudstone Nd-143/Nd-144) sedimentary phases elucidates the complex hydrologic history of the Borden Basin and reconciles these disparate interpretations. Episodic coupling and decoupling between the composition of basin waters (from Os and Sr isotopes) and the local weathering input to the basin (from Nd isotopes) indicate that depositional environments within the Borden Basin fluctuated between marine and nonmarine (i.e., lacustrine). Variations in basin hydrology controlled secular sedimentation patterns through changes in basin water chemistry. These interpretations help to characterize the environment in which the early red algal fossil Bangiomorpha pubescens evolved. Episodically restricted epeiric seaways, such as within the Borden Basin, were relatively widespread within Rodinia and may have exerted unique selective pressures on eukaryotic evolution in the Mesoproterozoic Era. Hydrogenous and detrital radiogenic isotope chemostratigraphy, as implemented in this study, may provide a useful paleoenvironmental framework for future paleontological studies aimed at testing the role of freshwater environments in eukaryotic evolution. In addition, Sr-87/Sr-86 compositions from 81 new middle Bylot Supergroup marine limestone samples, calibrated by recent Re-Os geochronology, contribute to the terminal Mesoproterozoic marine Sr-87/Sr-86 curve. These data display a rise from similar to 0.705 to 0.706 that reflects weathering of the active Grenville orogenic belt and demonstrates a global increase in chemical weathering during the amalgamation of Rodinia. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493796300012 |
WOS关键词 | PROTEROZOIC BYLOT SUPERGROUP ; RE-OS GEOCHRONOLOGY ; BAFFIN-ISLAND ; BLACK SHALES ; SM-ND ; U-PB ; PHOTOSYNTHETIC EUKARYOTES ; FACIES MICROFOSSILS ; CARBONATE RAMP ; IGNEOUS EVENTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/188064 |
专题 | 地球科学 |
作者单位 | 1.McGill Univ, Dept Earth & Planetary Sci, Geotop, Montreal, PQ H3A 0E8, Canada; 2.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada; 3.Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA; 4.Weizmann Inst Sci, Dept Earth & Planetary Sci, IL-76100 Rehovot, Israel; 5.Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA |
推荐引用方式 GB/T 7714 | Gibson, Timothy M.,Worndle, Sarah,Crockford, Peter W.,et al. Radiogenic isotope chemostratigraphy reveals marine and nonmarine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1965-1978. |
APA | Gibson, Timothy M.,Worndle, Sarah,Crockford, Peter W.,Bui, T. Hao,Creaser, Robert A.,&Halverson, Galen P..(2019).Radiogenic isotope chemostratigraphy reveals marine and nonmarine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1965-1978. |
MLA | Gibson, Timothy M.,et al."Radiogenic isotope chemostratigraphy reveals marine and nonmarine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1965-1978. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论