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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 12    December 2019

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Genesis of Qujiashan manganese deposit, Shaanxi Province: constraints from geological, geochemical, and carbon and oxygen isotopic evidences
WANG Zi-yong(王子勇)1, HAN Run-sheng(韩润生)1, REN Tao(任涛)1, WU Yong-tao(吴永涛)1, LI Hu-jie(李虎杰)2

1. Faculty of Land Resource Engineering, Kunming University of Science and Technology,Kunming 650093, China;
2. College of Environment and Resource, Southwest University of Science and Technology,
Mianyang 621010, China

Abstract:The Qujiashan manganese deposit is located in the Longmen-Daba fold belt along the northern margin of the Yangtze Block. The layered ore bodies are distributed within the purple-red calcareous shale. Qujiashan is a high-grade w(MnO)=8.92% to 18.76%) manganese deposit with low-phosphorus w(P2O5)=0.08% to 0.16%) content. It also has a low total REEs contents (with an average of 101.3×10-6), and has inconspicuous Ce (0.81 to 1.29) and Eu (1.00 to 1.25) anomalies. lg(Ce/Ce*) values are from -0.02 to 0.11. The ores have high SiO2/Al2O3 and Al/(Al + Fe + Mn) ratios. In figures of Fe–Mn–[(Ni+Cu+Co)×10] and lgU–lgTh, all samples show that hydrothermal exhalative fluids played an important role during mineralisation. The δ13CPDB and δ18OSMOW values of eight ore samples are from -20.7‰ to -8.2‰ (with an average of -12.4‰) and from 14.3‰ to 18.7‰ (with an average of 17.0‰), respectively. These carbon and oxygen isotopic features indicate that hydrothermal fluids derived from deep earth are participation in the metallogenic process, which is also supported by high paleo-seawater temperatures varying from 47.08 to 73.98 °C. Therefore, the geological and geochemical evidences show that the Qujiashan deposit formed from submarine exhalative hydrothermal sedimentation.

 

Key words: manganese deposit; element geochemistry; carbon and oxygen isotopes; genesis; Qujiashan manganese deposit

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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