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Yang X.,Hefei University of Technology | Wang B.,No. 313 Geological Team | Du Z.,No. 313 Geological Team | Wang Q.,No. 313 Geological Team | And 4 more authors.
Acta Petrologica Sinica | Year: 2012

The Huoqiu iron ore field in Northwest Anhui Province is located in the North China craton. As a large BIF iron ore field, the ore bodies are resident in a middle-high grade of metamorphism formation in the period of Neo-Archean, forming a banded silicon-iron series from north and south. The main ore bodies can be divided into two sub-belts from bottom to upper layers, i. e., the A + B ore belt, consisting of granulite-schist-magnetite-quartz formation; and the D ore belt, consisting of schist-marble-hematite-quartz formation. Combined with the geological background, geophysical and geochemical exploration, ore-forming conditions and structural form of the iron deposit, we present a comprehensive understanding on structural types, speculation surrounding, deep tectonic and orecontrolling factors as well as characteristics and distribution of this colossal BIF ore filed in the Huoqiu region. Using LA-ICP-MS techniques, we obtained the oldest U-Pb age of ca. 2. 8Ga for plagioclase amphibolites as the forming age of original rock and 1. 8Ga for magmatitic granites. The Hf isotopes were also obtained from zircons separated from the Huoqiu Group. We measured an oldest Hf model age of 3. 5Ga in zircon. According to the characteristics of this BIF and iron ores, this paper firstly proposed the concept of "Huoying Movement", accounting for tectonic event with the metamorphism and metallogenesis in the Neo-Archean around 2. 7Ga in the Huoqiu-Yingshang- Shouxian-Mengcheng regions, Northwest Anhui, which is differed from the former Bengbu Movement occurred in Northeast Anhui for description on both metamorphism and metallogenesis in these two regions. Finally we regard the iron deposit and BIF in the Huoqiu region as a transitional iron formation between Algoma and Superior types according to the volcanic-sedimentary characteristics in the Huoqiu Group.


Yang X.,Hefei University of Technology | Liu L.,Hefei University of Technology | Lee I.,Seoul National University | Wang B.,No. 313 Geological Team | And 4 more authors.
Ore Geology Reviews | Year: 2014

The Huoqiu iron ore field in northwest Anhui Province is located in the North China Craton (NCC). As a large banded iron formation (BIF) iron ore field, ore bodies occur in a middle-high grade of Neoarchean metamorphic formation, forming a banded silicon-iron series from north to south. The main ore bodies can be divided into two sub-belts from bottom to upper layers, i.e. the A. +. B ore belt consisting of leptynite-schist-magnetite-quartz formation, and the D ore belt consisting of schist-marble-hematite-quartz formation. Based on a dataset from geological settings, geophysical and geochemical exploration, ore-forming conditions and structural analysis of the iron deposit, we discuss structural types, sedimentary environments, deep tectonic and ore-controlling factors as well as characteristics and distribution of this colossal BIF ore field in the Huoqiu region.Using LA-ICP-MS techniques, we obtained the oldest U-Pb age of ca. 2.7. Ga for plagioclase amphibolite as its original rock, and 1.8. Ga for magmatic granite in the Huoqiu Group. The Hf isotopes of zircon were also determined, resulting in the oldest Hf model age of 3.5. Ga.Geochemical data indicate that the protolithes of amphibolites belong to a series of subalkaline rocks with enrichments of large ion lithophile elements and depletions of high field strength elements, which are typical volcanic arc rocks. The amphibolites have low K2O concentrations with low ratios of Ti/V (22.7 to 25.9 averaging 24.5), similar to island arc tholeiite. This suggests that the iron deposit and BIF are of the Superior type in the Huoqiu region. © 2014.

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