Research output: Contribution to journal › Article
A refined late-Cryogenian – Ediacaran Earth history of South China: phosphorous-rich marbles of the Dabie and Sulu orogens . / Prave, A. R.; Meng, F.; Lepland, A.; Kirsmäe, K.; Kreitsmann, T.; Jiang, C. Z.
In: Precambrian Research, Vol. 305, 02.2018, p. 166-176.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A refined late-Cryogenian – Ediacaran Earth history of South China:
T2 - phosphorous-rich marbles of the Dabie and Sulu orogens
AU - Prave, A. R.
AU - Meng, F.
AU - Lepland, A.
AU - Kirsmäe, K.
AU - Kreitsmann, T.
AU - Jiang, C. Z.
N1 - This research was supported by the National Natural Science Foundation of China Grant Numbers 41473039 and 4151101015, and by the Estonian Science Agency project PUT0696.
PY - 2018/2
Y1 - 2018/2
N2 - The late-Cryogenian – Ediacaran geological framework for South China is constructed principally from sedimentary successions preserved in the central and western regions of the Yangtze Block. New stratigraphic and carbonate-carbon isotope data allow us to extend that framework into the exhumed HP-UHP subduction complexes of the eastern Dabie and Sulu orogens that separate the South and North China cratons. Those data show that marble and phosphorous-rich (P-rich) units in those complexes were originally part of an Ediacaran shallow-marine shelf-carbonate platform. The basal pebbly schist (metadiamictite) and lowermost P-rich marble of the Jinping Formation (Haizhou Group) in the Sulu Orogen matches in both facies character and C-isotope profile that of the Marinoan-equivalent glacial-cap carbonate couplet of the Nantuo and Doushantuo formations. The Daxinwu Formation (Susong Group) in the eastern Dabie Orogen contains a marble unit that has, for several hundreds of metres, a strikingly uniform C-isotope profile of low δ13C positive values and is overlain by a P-rich graphitic schist; these features match those of the late Ediacaran to early Cambrian Dengying Formation. These correlations establish that the HP-UHP metasedimentary rocks, many of which were once considered to be Palaeo- to Mesoproterozoic in age, are a Neoproterozoic-age cover sequence of the continental margin of the Yangtze Block. Further, their widespread development limits their utility as indicators of offset across the Tan-Lu fault zone and, instead, favours tectonic models that interpret that feature as a continental-scale tear fault formed during the Mesozoic collision and suturing of the North and South China cratons.
AB - The late-Cryogenian – Ediacaran geological framework for South China is constructed principally from sedimentary successions preserved in the central and western regions of the Yangtze Block. New stratigraphic and carbonate-carbon isotope data allow us to extend that framework into the exhumed HP-UHP subduction complexes of the eastern Dabie and Sulu orogens that separate the South and North China cratons. Those data show that marble and phosphorous-rich (P-rich) units in those complexes were originally part of an Ediacaran shallow-marine shelf-carbonate platform. The basal pebbly schist (metadiamictite) and lowermost P-rich marble of the Jinping Formation (Haizhou Group) in the Sulu Orogen matches in both facies character and C-isotope profile that of the Marinoan-equivalent glacial-cap carbonate couplet of the Nantuo and Doushantuo formations. The Daxinwu Formation (Susong Group) in the eastern Dabie Orogen contains a marble unit that has, for several hundreds of metres, a strikingly uniform C-isotope profile of low δ13C positive values and is overlain by a P-rich graphitic schist; these features match those of the late Ediacaran to early Cambrian Dengying Formation. These correlations establish that the HP-UHP metasedimentary rocks, many of which were once considered to be Palaeo- to Mesoproterozoic in age, are a Neoproterozoic-age cover sequence of the continental margin of the Yangtze Block. Further, their widespread development limits their utility as indicators of offset across the Tan-Lu fault zone and, instead, favours tectonic models that interpret that feature as a continental-scale tear fault formed during the Mesozoic collision and suturing of the North and South China cratons.
KW - Dabie Orogen
KW - Sulu Orogen
KW - Haizhou group
KW - Susong group
KW - Ediacaran
KW - Marinoan glaciation
KW - Phosphorite
U2 - 10.1016/j.precamres.2017.11.022
DO - 10.1016/j.precamres.2017.11.022
M3 - Article
VL - 305
SP - 166
EP - 176
JO - Precambrian Research
JF - Precambrian Research
SN - 0301-9268
ER -
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
Research output: Contribution to journal › Article
ID: 251679906