Paleoproterozoic crustally derived carbonate-rich magmatic rocks from the Daqinshan area, North China Craton Geological, petrographical, geochronological and geochemical (Hf, Nd, O and C) evidence

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	Paleoproterozoic crustally derived carbonate-rich magmatic rocks from the Daqinshan area, North China Craton Geological, petrographical, geochronological and geochemical (Hf, Nd, O and C) evidence
	Wan, YS (Wan, Yusheng); Liu, DY (Liu, Dunyi); Xu, ZY (Xu, Zhongyuan); Dong, CY (Dong, Chunyan); Wang, ZJ (Wang, Zhejiu); Zhou, HY (Zhou, Hongying); Yang, ZS (Yang, Zhensheng); Liu, ZH (Liu, Zhenghong); Wu, JS (Wu, Jiashan)
刊名	AMERICAN JOURNAL OF SCIENCE
	2008
卷号	308 期号:3 页码:351-378
ISSN号	0002-9599
英文摘要	Most carbonate-rich magmatic rocks are mantle-derived, namely carbonatite(s), with a minority of them being contaminated by crustal rocks. It is debated whether there are also carbonate-rich magmatic rocks derived solely from crustal sources. In this contribution, we report crustally derived carbonate-rich magmatic rocks, named here crustal carbonatite(s), in the Daqingshan area, Western Block of the North China Craton. The Daqingshan crustal carbonatites were previously considered to be metasedimentary marbles. However, they cut adjacent rocks and contain some enclaves that are irregular in shape and show unoriented distribution of lithologies that cannot be found in the local wall rocks. Zircons from the crustal carbonatites show clear oscillatory zoning, and contain calcite, quartz, feldspar, diopside and CO(2) inclusions. The zircons have correlated U and Th abundances and give a U/Pb age of 1951 +/- 5 Ma, being the same age as metamorphic zircon cores and rims from a diopsidite enclave (1954 +/- 27 Ma of core and 1944 +/- 40 Ma of rim). The zircon from the crustal carbonatite has t(DM)(Hf) and epsilon(Hf)(t) of 2353 to 2457 Ma and -3.2 to 0.7, whereas the t(DM)(Hf) and epsilon(Hf)(t) of the core and rim zircons from diopsidite range from 2228 to 2160 Ma and 3.0 to 4.8 and 2219 to 2057 Ma and 3.2 to 7.4, respectively. The delta(18)O (parts per thousand)(Zircon-V-PDB) of zircon from the crustal carbonatite ranges from -21.5 to -19.6, with 0 isotope equilibrium temperature being 555 degrees C to 635 degrees C. The crustal carbonatite shows a large variation in chemical composition, with SiO(2) = 10.2-37.3% and Total REE=48-267 ppm. The t(DM)(Nd) age and epsilon(Nd)(t) are similar to 2.5 Ga and -2.9 to -2.4. The delta(18)O (parts per thousand)(Rock-V-PDB) and delta(13)C(parts per thousand) (Rock-V-PDB) vary from -19.5 to -15.2 and from -5.2 to -2.4, being distributed between primary carbonatite field and the field of dolomitic marble from the study area in delta(18)O(parts per thousand) vs. delta(13)C(parts per thousand) diagram. Combined with previous studies, we drew the conclusion that some of the carbonate-rich rocks in the study area are magmatic in origin, by anatexis of impure marble plus common contamination by calc-silicates and other materials. This is consistent with the high-P-T experiments of CaO-CO(2)-H(2)O system (Wyllie and Tuttle, 1960) and MgO-CaO-CO(2)- H(2)O system (Fanelli and others, 1986), which indicate that partial melting of limestone will happen when temperature is > 700 degrees C and when water is also present.
学科主题	前寒武纪地质
WOS关键词	U-PB GEOCHRONOLOGY ; OXYGEN-ISOTOPE FRACTIONATION ; ENRICHED MANTLE SOURCE ; LA-ICP-MS ; KOLA-PENINSULA ; SILICATE MINERALS ; KHONDALITE BELT ; SOUTHERN INDIA ; ALKALINE ; ZIRCON
WOS研究方向	Geology
语种	英语
出版者	AMER JOURNAL SCIENCE
WOS记录号	WOS:000257038900008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38661]
专题	中国地质调查局
作者单位	Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China
推荐引用方式 GB/T 7714	Wan, YS ,Liu, DY ,Xu, ZY ,et al. Paleoproterozoic crustally derived carbonate-rich magmatic rocks from the Daqinshan area, North China Craton Geological, petrographical, geochronological and geochemical (Hf, Nd, O and C) evidence[J]. AMERICAN JOURNAL OF SCIENCE,2008,308(3):351-378.
APA	Wan, YS .,Liu, DY .,Xu, ZY .,Dong, CY .,Wang, ZJ .,...&Wu, JS .(2008).Paleoproterozoic crustally derived carbonate-rich magmatic rocks from the Daqinshan area, North China Craton Geological, petrographical, geochronological and geochemical (Hf, Nd, O and C) evidence.AMERICAN JOURNAL OF SCIENCE,308(3),351-378.
MLA	Wan, YS ,et al."Paleoproterozoic crustally derived carbonate-rich magmatic rocks from the Daqinshan area, North China Craton Geological, petrographical, geochronological and geochemical (Hf, Nd, O and C) evidence".AMERICAN JOURNAL OF SCIENCE 308.3(2008):351-378.