干旱区生态环境知识资源中心(Arid): Genesis of Archean to Paleoproterozoic banded iron formations in the North China Craton: Geological and paleoenvironmental implications

Arid

DOI	10.1016/j.earscirev.2024.104710
	Genesis of Archean to Paleoproterozoic banded iron formations in the North China Craton: Geological and paleoenvironmental implications
	Jiang, Kang; Wang, Junpeng; Kusky, Timothy; Polat, Ali; Huang, Bo; Wang, Lu; Li, Shengli; Deng, Hao; Peng, Yaying
通讯作者	Wang, JP
来源期刊	EARTH-SCIENCE REVIEWS
ISSN	0012-8252
EISSN	1872-6828
出版年	2024
卷号	250
英文摘要	The source characteristics and depositional environments of banded iron formations (BIFs) can provide key information on the chemical composition, redox environment, and tectonic evolution of early Precambrian paleo-oceans. Large quantities of Neoarchean to Paleoproterozoic BIFs are exposed in the North China Craton (NCC). This study focuses on petrography, major and trace element geochemistry, zircon U-Pb geochronology, and Sm-Nd isotopic compositions of a set of Neoarchean BIF-bearing sedimentary rocks preserved in the Zanhuang Massif of the NCC, including comparison with Archean to Paleoproterozoic BIFs throughout the NCC. This study provides constraints for deciphering the paleo-ocean chemical composition, redox environment and relationship between the geological-environments co-evolution and the formation of the BIFs in the NCC. The Zanhuang BIFs are mainly composed of quartz and magnetite, with small amounts of grunerite, actinolite (ferroactinolite) and garnet in the Fe-rich bands, and are classified as Algoma-type. Zircon U-Pb ages of the metasedimentary rocks interbedded with the BIFs indicate that the Zanhuang BIFs formed at similar to 2.51 Ga and were subjected to metamorphism at similar to 2.47-2.48 Ga. Most BIFs have low contents of Al2O3, TiO2 and high field strength elements Zr, Hf, Th and U, indicating that they are pure chemical sedimentary rocks. The BIFs are characterized by depleted light rare earth elements (LREEs) and positive La and Y anomalies, which are similar to the geochemical characteristics of modern seawater. The absence of Ce anomalies and the low (Pr/Yb)SN ratios indicate an anoxic state of the ocean. The Zanhuang BIFs precipitated from a mixture of minor high-temperature hydrothermal fluids and seawater mixed with continent-derived freshwater (similar to 10-20%) or other additional fluids such as ocean crust-derived fluxes indicated by Eu anomalies and Y/Ho and Sm/Yb ratios. The variable initial epsilon Nd(t) values of Zanhuang BIFs suggest complex and dynamic input of continental crustal fluxes. The statistical comparison with other BIFs shows that the peak formation ages of the Archean to Paleoproterozoic BIFs in the NCC is similar to 2.54 Ga. Most of the BIFs in the NCC are Algoma-type, while a few Paleoproterozoic BIFs are Superior-type. A mixture of <0.1%-1% of modern seafloor high-temperature hydrothermal and seawater can account for the REE + Y characteristics of the BIFs, while epsilon Nd(t) values suggest possible contributions from continental sources. The Eu anomalies indicate that similar to 2.7 Ga and similar to 2.55 Ga are the two peaks of submarine hydrothermal and magmatic activities of the NCC, which correspond to crustal growth and subduction-collision events in the NCC, respectively. The Ce anomalies and Fe isotopes indicate the transition from an anoxic ocean with possible regional oxygen oases before 2.5 Ga to a redox-stratified ocean during the GOE. Most Neoarchean BIFs of the NCC were formed in island arc-related tectonic settings, while the Paleoproterozoic BIFs likely reflect environments of rifting to subduction in the NCC.
英文关键词	Banded iron formation Zanhuang Massif Neoarchean Tectonic environment North China Craton
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001188038300001
WOS关键词	RARE-EARTH-ELEMENTS ; ZIRCON U-PB ; ANSHAN-BENXI AREA ; CENTRAL OROGENIC BELT ; NEODYMIUM ISOTOPIC COMPOSITIONS ; PENNSYLVANIAN-PERMIAN AGE ; UPPER CONTINENTAL-CRUST ; GUYANG GREENSTONE-BELT ; GA PONGOLA SUPERGROUP ; REE PLUS Y
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403340
推荐引用方式 GB/T 7714	Jiang, Kang,Wang, Junpeng,Kusky, Timothy,et al. Genesis of Archean to Paleoproterozoic banded iron formations in the North China Craton: Geological and paleoenvironmental implications[J],2024,250.
APA	Jiang, Kang.,Wang, Junpeng.,Kusky, Timothy.,Polat, Ali.,Huang, Bo.,...&Peng, Yaying.(2024).Genesis of Archean to Paleoproterozoic banded iron formations in the North China Craton: Geological and paleoenvironmental implications.EARTH-SCIENCE REVIEWS,250.
MLA	Jiang, Kang,et al."Genesis of Archean to Paleoproterozoic banded iron formations in the North China Craton: Geological and paleoenvironmental implications".EARTH-SCIENCE REVIEWS 250(2024).