气候变化领域集成服务门户(CCPortal): Mesoproterozoic burial of the Kaapvaal craton, southern Africa during Rodinia supercontinent assembly from (U-Th)/He thermochronology

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DOI	10.1016/j.epsl.2019.115930
	Mesoproterozoic burial of the Kaapvaal craton, southern Africa during Rodinia supercontinent assembly from (U-Th)/He thermochronology
	Baughman J.S.; Flowers R.M.
发表日期	2020
ISSN	0012821X
卷号	531
英文摘要	We present THe and ZHe data for basement samples across the Kaapvaal craton to investigate the cratonic burial and erosion history during the assembly and breakup of the Rodinia supercontinent. THe and ZHe dates vary from 1187 to 135 Ma and 997 to 32 Ma, respectively. Both are negatively correlated with effective U concentration, consistent with lower He retentivity at higher radiation damage dose. The oldest THe dates, combined with volcanic rocks that document the basement was at the surface at ∼1.4 Ga, require heating to ≥130 °C at ∼1.0-1.2 Ga to cause complete He loss from the titanites. We attribute this Mesoproterozoic heating event to widespread burial of the craton during Rodinia supercontinent assembly by sediments shed from the Namaqua-Natal orogen on the craton's margin. Later Neoproterozoic-Paleozoic erosion re-exhumed the basement to the surface. Spatial variability in ZHe data patterns can be explained by geologically-reasonable differences in Phanerozoic Karoo basin burial and erosion. The Mesoproterozoic and Karoo burial phases are analogous in that their detritus was derived from similarly-located orogens during two different supercontinent cycles. Mesoproterozoic deposition across the Kaapvaal craton may be part of a more global signal of burial and erosion during Rodinia assembly and breakup. Our dataset illustrates the power of THe and ZHe thermochronology for detecting missing Proterozoic depositional events in the rock record. © 2019 Elsevier B.V.
关键词	(U-Th)/He burial Kaapvaal craton Namaqua-Natal Rodinia thermochronology
英文关键词	Buildings; Deposition; Radiation damage; Volcanic rocks; (U-Th)/He; burial; Kaapvaal; Namaqua-Natal; Rodinia; Thermochronology; Erosion
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202481
作者单位	Department of Geological Sciences, University of Colorado at Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Baughman J.S.,Flowers R.M.. Mesoproterozoic burial of the Kaapvaal craton, southern Africa during Rodinia supercontinent assembly from (U-Th)/He thermochronology[J],2020,531.
APA	Baughman J.S.,&Flowers R.M..(2020).Mesoproterozoic burial of the Kaapvaal craton, southern Africa during Rodinia supercontinent assembly from (U-Th)/He thermochronology.Earth and Planetary Science Letters,531.
MLA	Baughman J.S.,et al."Mesoproterozoic burial of the Kaapvaal craton, southern Africa during Rodinia supercontinent assembly from (U-Th)/He thermochronology".Earth and Planetary Science Letters 531(2020).