MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN

CHENG Yu; LI Xiang-qian; ZHAO Zeng-yu; ZHANG Xiang-yun; GUO Gang

2016 Vol. 22, No. 4

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CHENG Yu, LI Xiang-qian, ZHAO Zeng-yu, ZHANG Xiang-yun, GUO Gang. MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN[J]. Journal of Geomechanics, 2016, 22(4): 994-1003.

Citation:

CHENG Yu, LI Xiang-qian, ZHAO Zeng-yu, ZHANG Xiang-yun, GUO Gang. MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN[J]. Journal of Geomechanics, 2016, 22(4): 994-1003.

MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN

The Institute of Geological Survey of Jiangsu Province, Nanjing 210049, China

Received Date: 16 June 2016

Publish Date: 25 December 2016

Abstract

Abstract

The core TZK9 is located in the northeast Taizhou city (N 32°35', E120°6'), the south of Subei Basin. The main kinds of lithology in the core are clay and silty clay. Some silt, sand and coarse sand are also found. In this study, 382 samples at 30~60 cm intervals were taken for paleomagnetic measurements, and 17 samples for heavy minerals test. Magnetostratigraphic results show that, the M/G and B/M are found at the depth of 250.3 and 78.5 m, respectively. Extrapolation with accumulation rates suggest that the basal ages for sediments in this core is about 3.0 Ma. ATi index was from 50.97 to 100, while GZI index was 11.48 to 77.81, indicating that the source was metamorphic and igneous rocks. During 3.0~2.6 Ma, the main heavy minerals of TZK9 core were ilmenite, epidote, magnetite, garnet and zircon. Comparing the heavy minerals of the TZK9 core with Huai river and Yangtze river, it shows that the sediment came from the Huai river during this time. During 2.6~0 Ma, the main heavy minerals are ilmenite, epidote, zircon, apatite, garnet and magnetite. The content of zircon, apatite, tourmaline, rutile increases compared to the previous period, and it indicates that the Yangtze river begin to influence this area in this period. And the ZTR index gradually increased since 2.6 Ma, which may be related to the change of global climate.
- Late Pliocene /
- magnetic stratigraphy /
- heavy minerals /
- the Subei Basin

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References

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