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Gaotaigou, Zhuanmiao, Wengquangou (Liaoning & Jilin Provinces) |
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China |
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B
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Gaotaigou, Zhuanmiao and Wengquangou borate deposits are part of a regional resource in the Liaoning and Jilin Provinces of northern China.
These deposits are developed within a Palaeoproterozoic greenschist-amphibolite-grade metasedimentary sequence found between two Archaean granite-greenstone belt cratons. The host sequence, which is up to 800 m thick, comprises a pile of metasediments, metavolcanics and nonmarine evaporites extending for 300 km in an east-west direction and are intruded by 2.1 Ga granitoids.
The deposits are subdivided into a Mg-rich, Fe-poor varieties (mainly composed of suanite and szaibelyite) and Mg-Fe-rich deposits in which the borates are mainly present as ludwigite. The host to these borates are Mg-rich carbonate intercalations within tourmaline-bearing leptynites, which are interpreted to be the metamorphosed equivalents of evaporites enclosed within volcanic tuffs. These are immediately underlain by biotite leptynites, interpreted to be meta-tuffs, which in turn overlie magnetite-microcline leptites that are thought to have been derived from the metamorphism of primary red beds. The ore bed is overlain by albite-microcline-rich leptites, which are believed to be the equivalents of tuffs and pyroclastic rocks which were altered by Na-K-rich evaporite brines.
Proven reserves from a number of deposits total more than 25 Mt of B2O3. These deposits currently yield around 250 000 tonnes of boric acid and borax per annum (2001), but have potential to total a much larger tonnage.
For more detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2002.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Peng Q-M, Palmer M R 2002 - The Paleoproterozoic Mg and Mg-Fe Borate deposits of Liaoning and Jilin Provinces, northeast China: in Econ. Geol. v97 pp 93-108
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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