CCSD Main Hole, Maobei, Donghai Co., Lianyungang Prefecture, Jiangsu Province, China

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The Chinese Continental Scientific Drilling (CCSD) project aims to reconstruct the formation and exhumation mechanisms of ultra-high pressure (UHP) metamorphic terranes. The major goals are to investigate the variation of fluid composition with depth, the flow patterns and cycling mechanisms, as well as changes of the fluid regime in time.

The drill sites are located in the southern part of the Sulu UHP terrane. Eclogite and associated kyanite quartzite, garnet-jadeite quartzite, and ultramafic rocks are distributed as intercalated layers of gneissic country rock. All rock types have been subjected to the same UHP event. The CCSD consists of three pilot holes and a main drill hole which reached its final depth of 5,180 m in March 2005. Prior to the start of the project, several shallow pre-pilot (PP) holes were driven, and there are also many other drill holes in the area that were driven for mineral exploration.

Garnet peridotites collected at depths between 603.2 m and 683.4 m from the main hole contain microscopic inclusions of a wide variety of unusual minerals, among them native metals and numerous alloys (Fe-Cr-Si, Fe-Cr-C, Fe-Cr-Ni, Ni-Co-Cr, Fe-Si-C, Fe-Si-Ti, Fe-Si-Ni, Fe-P and others). Compositions and structures of these phases are very similar to those found in the Luobusa ophiolite, but they occur in a completely different tectonic environment here.

References

- Liu Xiangwen, Jin Zhenmin, Qu Jing, and Wang Lu (2005): Exsolution of ilmenite and Cr-Ti magnetite from olivine of garnet-wehrlite. Science in China, Series D (Earth Sciences), 48(9), 1368-1376.
- Yilin Xiao, Zheming Zhang, Hoefs, J., and van den Kerkhof, A. (2006): Ultrahigh-pressure metamorphic rocks from the Chinese Continental Scientific Drilling Project: II Oxygen isotope and fluid inclusion distributions through vertical sections. Contributions to Mineralogy and Petrology 152, 443-458.
- Jingsui Yang, Zhiqin Xu, Wenji Bai, Qingsong Fang, and Zhongming Zhang (2006): Unusual Alloys in Garnet Peridotite from the Chinese Continental Scientific Drilling Project (CCSD) Main Hole in Sulu. 3rd Annual Meeting of the Asia Oceania Geosciences Society (AOGS), July 10-14, 2006, Abstract 59-SE-A0643.
- Xu, Z., Zeng, L., Liu, F., Yang, J., Zhang, Z., McWilliams, M., and Liou, J.G. (2006): Polyphase subduction and exhumation of the Sulu high-pressure - ultrahigh-pressure metamorphic terrane. In: Hacker, B.R., McClelland, W.C., and Liou, J.G. (eds.): Ultrahigh-pressure metamorphism: Deep continental subduction. GSA Publications, Boulder (CO), USA, pp. 93-114.

External Links

http://www.icdp-online.de/news/workshops/abstracts/AGU04/V14A-07.htm

Mineral List

Aegirine 'Albite-Anorthite Series' 'Almandine-Pyrope Series' Aluminium Andradite Augite Biotite 'Chlorite Group' Chromium

Clinohumite Coesite Copper Diopside var: Chromian Diopside Epidote Gold Hematite Ilmenite Iron

Iron var: Kamacite 'K Feldspar' Kyanite Magnetite var: Titaniferous Magnetite Moissanite Nickel 'Olivine' Omphacite

Phengite Quartz Rutile Taenite Titanite Wüstite Zoisite

34 entries listed. 24 valid minerals.