10.6084/m9.figshare.1466822.v4
Xiguang Deng
Xiguang
Deng
Liang Yi
Liang
Yi
Greig A. Paterson
Greig
A. Paterson
Huafeng Qin
Huafeng
Qin
Haifeng Wang
Haifeng
Wang
Huiqiang Yao
Huiqiang
Yao
Jiangbo Ren
Jiangbo
Ren
Junyi Ge
Junyi
Ge
Hongzhou Xu
Hongzhou
Xu
Chenglong Deng
Chenglong
Deng
Rixiang Zhu
Rixiang
Zhu
Magnetostratigraphic evidence for deep-sea erosion on the Pacific Plate, south of Mariana Trench, since the middle Pleistocene: potential constraints for Antarctic bottom water circulation
Taylor & Francis Group
2015
jl
polarity
chron
Pacific Ocean
sedimentation
cm
Eastern Pacific Oceans
Antarctic Bottom Water
Mariana Trench
Middle Pleistocene
Antarctic bottom water circulation
erosion
data
AABW
7KGC
2015-10-08 16:12:02
Journal contribution
https://tandf.figshare.com/articles/journal_contribution/Magnetostratigraphic_evidence_for_deep_sea_erosion_on_the_Pacific_Plate_south_of_Mariana_Trench_since_the_middle_Pleistocene_potential_constraints_for_Antarctic_bottom_water_circulation/1466822
<div><p></p><p>The Antarctic Bottom Water (AABW) current plays a crucial role in storing and transporting heat, water, and nutrients around the world. However, it is impossible to monitor AABW in the Plio-Pleistocene by direct measurement. Hence, abyssal erosion was usually chosen as an effective indicator of the presence of the AABW in the Indian and Eastern Pacific Oceans during that period. Here, we report a high-resolution magnetostratigraphy of a gravity core, the JL7KGC-01A from the south of the Mariana Trench, northwest Pacific Ocean. The main results are as follows: (1) polarity data suggest that the sequence recorded the late Gauss chron to the early Brunhes chron, including the Jaramillo, Cobb Mountain, and Olduvai normal subchrons; (2) the sedimentary processes in the study area since 2.9 Ma show three stages of sedimentation: 83 cm/Ma during 2.9–1.2 Ma, 183 cm/Ma during 1.2–0.7 Ma, and no sedimentation since ~0.7 Ma; (3) the area south of the Mariana Trench experienced a significant change in the deposition rate at 1.2 Ma, which could be correlated with the intensified desertification in inland Asia, and experienced a prominent depositional hiatus since the early middle Pleistocene, which likely resulted from the enhanced/expanded AABW. Based on these new polarity data and comparisons with previous studies around the Pacific Ocean, we therefore propose that the AABW experienced a notable change during the early–mid Pleistocene transition.</p></div>