ORCID Profile
0000-0002-9008-592X
Current Organisations
Shanghai Jiao Tong University
,
National Institute of Polar Research
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Publisher: American Geophysical Union (AGU)
Date: 10-2018
DOI: 10.1029/2018JB016082
Publisher: American Geophysical Union (AGU)
Date: 07-02-2022
DOI: 10.1029/2021GL096624
Abstract: The impact of central Asian aridification on the low latitude North Pacific Ocean since the late Miocene remains unclear. To address this question, we systematically studied an abyssal manganese nodule from the northwestern Pacific Ocean, which is expected to be sensitive to eolian dust sourced from central Asia. Geochemical variations and the fossilized remains of magnetotactic bacteria within the studied nodule manifest two prominent Asian aridification events at ∼8–7 Ma and 3.6–0 Ma. These results suggest that central Asian aridification impacted both primary productivity and abyssal microbial activity in the NW Pacific Ocean via eolian dust inputs. In contrast to the Pliocene aridification event, the late Miocene event was associated with a primary productivity bloom that is not evident in coeval global primary productivity records, which indicates that the ∼8–7 Asian aridification event was likely due to NE Tibetan Plateau uplift rather than to global cooling.
Publisher: American Geophysical Union (AGU)
Date: 03-2020
DOI: 10.1029/2019GC008811
Publisher: American Geophysical Union (AGU)
Date: 10-2020
DOI: 10.1029/2020JB020105
Publisher: American Geophysical Union (AGU)
Date: 29-09-2021
DOI: 10.1029/2021JB022680
Abstract: Silicate‐hosted magnetic inclusions are a widespread fine grained magnetic component in marine sediments. However, their paleomagnetic and paleoenvironmental significance remains elusive as they are often overshadowed by unprotected detrital and biogenic magnetic components. We developed a protocol to extract silicate inclusions from sediments s led from the central Pacific and the Okhotsk Sea. Our results show that the threshold condition (hydrochloric acid 10 mol/L with a reaction time of 24 h) can efficiently remove biogenic and unprotected magnetic phases and preserve silicate hosted magnetic inclusions that manifest a wide coercivity spectrum ranging between 10 and 300 mT with a median coercivity of ∼100 mT based on systematic rock magnetic analyses. This approach was applied to the Okhotsk Sea sediments, whose magnetic phases are dominantly derived from surrounding volcanic formations, spanning the last interglacial period. The residues after dissolution present a similar temporal variation compared to the bulk magnetic signal despite significant drops in litude. This suggests that the preserved signals of silicate inclusions can qualitatively represent the volcanic component. We suggest that when applied to sediments with complex magnetic components, this approach has the potential to extract volcanic components for paleoenvironmental reconstructions.
Location: China
No related grants have been discovered for Xiangyu Zhao.