干旱区生态环境知识资源中心(Arid): Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan

Arid

DOI	10.1127/njma/2021/0274
	Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan
	Salih, Makki Omer; Wan, Bo; Lentz, David R.
通讯作者	Salih, MO (corresponding author), Geol Res Author Sudan, POB 410, Khartoum, Sudan.
来源期刊	NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN
ISSN	0077-7757
出版年	2021
卷号	197 期号:2 页码:185-208
英文摘要	In this study, we divide anorogenic granitoids of northern Sudan to two types: aegirine to augite-bearing granites and syenites, and amphibole-bearing granites, based on petrographic and geochemical criteria. These granitoids are A-type characterized by high SiO2, Na2O, K2O, and Fe2O3T, with low contents of CaO, MgO, TiO2, and P2O5. The aegirineto augite-bearing granites and syenites have a low Y/Nb ratio <= 1.2, which are interpreted as Al-type suites, whereas the amphibole-bearing granite suite have average Y/Nb >= 1.2 that indicates A2-type granite. The Al-type granitoids are also characterized by high values of Nb, Ta, Y, Zr, Hf, Th, U, and REE and Li, Rb, Zn, and Be, enriclunent of the I,REE content relative to HREE (La/Yb ratios range from 2.1 to 22), pronounced to minor negative Eu anomalies (Eu/Eu* = 0.16-0.46), and agpaitic index ranging from 1.03 to 1.42 and moderate to high contents of HFSEs. In addition, IIFSE mineralization recognized in the samples show high Fep, and TiO2, consistent with the presence of magnetite, titanite, and zircon, as well as higher concentration of HFSE. In contrast, the A2-type granitoids show weakly fractionated REE patterns (La/Yb ranges from 2.4 to 2.9), minor Eu negative anomalies (Eu/Eu* = 0.47-0.59), with agpatic index ranging from 0.95 to 1.08 and moderate contents of HFSEs. Both of the A1- and A2-type granitoids are supposed to emplace in a within-plate environment, suggestive of an extensional geodynarnic setting, possibly mantle plume related. Estimate of crystallization pressures indicates that the amphibole-bearing granites suite (near 10 MPa) were shallowly emplaced, whereas the aegirine- and /or augite-bearing granites and syenites suite forms in a deeper magma chamber (similar to 190 MPa). The exposure of the two magmatic suites are due to reactivation of the Keraf faults that intersect with Atmur suture zone.
英文关键词	A-type granite within-plate anorogenic ring dykes rare earth elements high field strength elements Keraf zone Arabian Nubian Shield Sudan
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000704281100006
WOS关键词	A-TYPE GRANITES ; PRECAMBRIAN CRUSTAL EVOLUTION ; ARABIAN-NUBIAN SHIELD ; TECTONIC IMPLICATIONS ; BAYUDA DESERT ; ISOTOPE GEOCHEMISTRY ; BASEMENT-COMPLEX ; IGNEOUS COMPLEX ; EASTERN DESERT ; PLUTONIC ROCKS
WOS类目	Mineralogy
WOS研究方向	Mineralogy
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364237
作者单位	[Salih, Makki Omer] Geol Res Author Sudan, POB 410, Khartoum, Sudan; [Wan, Bo] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China; [Lentz, David R.] Univ New Brunswick, Dept Earth Sci, Fredericton, NB, Canada
推荐引用方式 GB/T 7714	Salih, Makki Omer,Wan, Bo,Lentz, David R.. Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan[J]. 中国科学院地质与地球物理研究所,2021,197(2):185-208.
APA	Salih, Makki Omer,Wan, Bo,&Lentz, David R..(2021).Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan.NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN,197(2),185-208.
MLA	Salih, Makki Omer,et al."Geochemistry and petrogenesis of anorogenic REE-bearing peralkaline granitoids from Northern Sudan".NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN 197.2(2021):185-208.