(Press-News.org) Boulder, Colo., USA: The Geological Society of America regularly publishes
articles online ahead of print. For March, GSA Bulletin topics
include multiple articles about the dynamics of China and Tibet; the ups
and downs of the Missouri River; the Los Rastros Formation, Argentina; the
Olympic Mountains of Washington State; methane seep deposits; meandering
rivers; and the northwest Hawaiian Ridge. You can find these articles at
https://bulletin.geoscienceworld.org/content/early/recent
.
Transition from a passive to active continental margin setting for the
NE Asian continental margin during the Mesozoic: Insights from the
sedimentary formations and paleogeography of the eastern Jiamusi
Massif, NE China
Yini Wang; Wenliang Xu; Feng Wang
Abstract:
The Mesozoic tectonic evolution of the NE Asian continental margin has
received much attention in recent years. However, previous studies focused
mainly on the petrogenesis of igneous rocks and their relationship with
Mesozoic tectonics, and there have been few studies of the Mesozoic
sedimentary formations of the NE Asian continental margin. We combined
zircon U-Pb ages with Hf isotopic and biostratigraphic data to reconstruct
the Mesozoic paleogeography of the NE Asian continental margin. The results
indicate that Mesozoic strata of the eastern Jiamusi Massif, NE China,
include the Upper Triassic Nanshuangyashan Formation (Norian), Lower
Jurassic volcanic rocks, and Lower Cretaceous Longzhaogou Group. The Upper
Triassic Nanshuangyashan Formation consists of a suite of alternating
marine and terrestrial sedimentary rocks with abundant fossils that formed
in a passive continental margin setting. The Lower Jurassic strata comprise
a suite of calc-alkaline volcanic rocks that include basaltic andesites,
andesites, and rhyolites that formed in an active continental margin
setting related to initial subduction of the Paleo-Pacific Plate beneath
Eurasia. The Lower Cretaceous Longzhaogou Group belong to alternating
marine and terrestrial sedimentary formations that formed in an active
continental margin setting related to subduction of the Paleo-Pacific
Plate. Here, we integrate these data to reconstruct the Mesozoic tectonic
history of the NE Asian continental margin, which comprises a Late Triassic
passive continental margin, the initiation of subduction of the
Paleo-Pacific Plate in the Early Jurassic, and westward subduction and
rollback of the Paleo-Pacific Plate in the Early Cretaceous.
View article:
https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/doi/10.1130/B35850.1/595823/Transition-from-a-passive-to-active-continental
Low-δ18O A-type granites in SW China: Evidence for the interaction
between the subducted Paleotethyan slab and the Emeishan mantle plume
Jian Xu; Xiao-Ping Xia; Qiang Wang; Christopher J. Spencer; Bin He ...
Abstract:
The mechanisms and processes by which subducted slab interacted with mantle
plume remain controversial, as direct observation of such interaction is
difficult to impossible. Compositional heterogeneity of large igneous
provinces (LIPs) additionally makes plume-slab interaction hard to detect.
Oxygen isotopes are sensitive enough to trace the source of magmas. Here we
provide evidence for plume-slab interaction mainly based on in situ zircon
Hf-O isotope analyses, as well as whole-rock elemental and Sr-Nd-Hf isotope
analyses, on the Late Permian and Early Triassic A-type granites on the
margin of the Emeishan LIP in SW China. These granites show typical A-type
geochemical characters, such as high total alkali (7.93−9.68 wt%) and field
strength element (HFSE, e.g., Zr and Nb) contents, and high FeOT
/(FeOT+MgO) (0.87−0.98) and Ga/Al (3.67−5.06) values. The Late
Permian (ca. 259 Ma) and Early Triassic (ca. 248 Ma) granites show high
Nb/Th (>3.0) and low Y/Nb ( END
New GSA Bulletin articles published ahead of print in March
2021-04-01
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To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/
(doi:10.1001/jamanetworkopen.2021.3990)
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