Match!

Petrogenesis and geodynamic implications of Neoproterozoic gabbro-diorites, adakitic granites, and A-type granites in the southwestern margin of the Yangtze Block, South China

Published on Oct 1, 2019in Journal of Asian Earth Sciences2.762
· DOI :10.1016/j.jseaes.2019.103977
Yu Zhu1
Estimated H-index: 1
(Northwest University (United States)),
Shaocong Lai20
Estimated H-index: 20
(Northwest University (United States))
+ 4 AuthorsBao-ping Gan1
Estimated H-index: 1
(Northwest University (United States))
Abstract
Abstract The occurrence of A-type granites following adakitic granites can provide unique insights into the tectonic evolution of subduction zone. This paper presents a comprehensive study of zircon U-Pb-Hf isotopes and whole-rock geochemistry on the Neoproterozoic gabbro-diorites, biotite granites, and K-feldspar granites in the southwestern margin of the Yangtze Block, South China. Zircon U-Pb dating of three distinctive intrusions yield concordant ages of 810.4 ± 2.0 Ma for gabbro-diorites, 800.3 ± 2.1 Ma for biotite granites, and 749.1 ± 2.0 Ma for K-feldspar granites. The gabbro-diorites are sodic and calc-alkaline rocks with low SiO2 (52.62–53.87 wt%), medium MgO (2.67–3.41 wt%), high Fe2O3T (7.18–7.49 wt%) and CaO (5.68–7.50 wt%) contents. They display high Th/Zr and Rb/Y ratios but low Nb/Zr and Nb/Y ratios. Together with their positive whole-rock eNd(t) (+1.0 to +1.5) and zircon eHf(t) values (+3.66 to +8.18), we suggest that these gabbro-diorites were derived from the partial melting of depleted lithospheric mantle modified by subduction-related fluids. The biotite granites display relatively high Sr contents (335–395 ppm), Sr/Y ratios (38.9–54.3), low Y (7.04–9.71 ppm) and Yb contents (0.78–1.08 ppm), resembling the adakitic granites. Their low Mg# (36–41) values, Cr (2.94–3.59 ppm) and Ni (1.32–1.55 ppm) contents as well as positive eNd(t) (+0.5 to +0.6) and eHf(t) values (+1.62 to +8.07) indicate that they were formed by partial melting of thickened juvenile mafic lower crust, probably within the existence of garnet. The K-feldspar granites have high SiO2 (76.61–77.14 wt%) and alkalis (Na2O + K2O = 8.55–9.69 wt%) contents, high 10,000 * Ga/Al (2.56–2.80) ratios and differentiation index (95.3–96.9), indicating the affinity to highly fractionated A-type granites. We suggest that these A-type granites were mainly generated by the partial melting of felsic crustal rocks under low pressure condition and subsequently extensive fractional crystallization is significant. Taking into account previous studies from the western Yangtze Block, South China, we propose that the gabbro-diorites, adakitic granites and A-type granites in this study were formed in persistent subduction process during the Neoproterozoic.
  • References (112)
  • Citations (2)
📖 Papers frequently viewed together
20183.91Lithos
7 Authors (Xiao-Yan Jiang, ..., Xiaoping Xia)
4 Citations
42 Citations
20203.91Lithos
6 Authors (Yu Zhu, ..., Zezhong Zhang)
1 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
References112
Newest
#1Yu Zhu (Northwest University (United States))H-Index: 1
#2Shaocong Lai (Northwest University (United States))H-Index: 20
Last. Zezhong Zhang (Northwest University (United States))H-Index: 1
view all 6 authors...
ABSTRACTNeoproterozoic I-type granites could provide vital insights into the crust–mantle interaction and the crustal evolution along the western Yangtze Block, South China. This paper presents new...
2 CitationsSource
#1Jun-Hong Zhao (China University of Geosciences)H-Index: 23
#2Mei-Fu Zhou (China University of Geosciences)H-Index: 71
Last. Wei Wang (China University of Geosciences)H-Index: 42
view all 5 authors...
Subduction of oceanic slabs can physically and chemically modify mantle wedges, but how mantle wedges are temporally evolved is difficult to be constrained. In this study, we use in situ zircon U–Pb ages and Hf–O isotopes of mafic intrusions to examine a coupled evolution of magmas and mantle sources above a subduction zone. Neoproterozoic mafic intrusions in the western margin of the Yangtze Block are mostly composed of gabbros that were formed in an arc system during 870–750 Ma followed by gen...
2 CitationsSource
#1Xiang-Dong Liao (JLU: Jilin University)H-Index: 1
#2Song Sun (JLU: Jilin University)H-Index: 1
Last. Wenna Zhou (Lanzhou University)H-Index: 4
view all 6 authors...
Abstract Whole-rock major and trace elements, zircon U Pb geochronology and Hf isotopic data have been implemented for the felsic rocks from the Sishijia pluton in southeastern Inner Mongolia, North China, in order to determine their petrogenesis and futher constrain the termination of Paleoasian Oceanic subduction in southeastern Central Asian Orogenic Belt. Petrographic observation indicates that Sishijia granitoids mainly consist of syenogranites and porphyritic granites, with the major miner...
1 CitationsSource
#1Jun-Hong Zhao (China University of Geosciences)H-Index: 23
#2Qi-Wei Li (China University of Geosciences)H-Index: 2
Last. Wei Wang (China University of Geosciences)H-Index: 42
view all 4 authors...
Abstract The South China Craton consists of the Yangtze and Cathaysia blocks that were welded together along the Jiangnan Fold Belt in the Neoproterozoic. The Neoproterozoic magmatism in the western and northern margins of the Yangtze Block is characterized by voluminous volcano-sedimentary strata, numerous felsic intrusions and many mafic-ultramafic plutons which provide a good opportunity to examine the geodynamics and tectonic evolution of the South China Craton during the assembly and breaku...
15 CitationsSource
#1Jun-Hong Zhao (China University of Geosciences)H-Index: 2
#2Paul D. Asimow (California Institute of Technology)H-Index: 39
Mafic magmas generated in extensional tectonic settings preserve important information about the nature of their mantle sources, interactions between crust and mantle, and the processes associated with magmatic evolution. However, careful study is needed to interpret the complex petrogenesis and diverse origins of such rock suites. A large volume of c.650 Ma mafic and ultramafic dikes are found in the South Qinling Belt (SQB) along the northern margin of the Yangtze Block, South China. The dikes...
8 CitationsSource
#1Yuejun Wang (SYSU: Sun Yat-sen University)H-Index: 49
#2Chengshi Gan (SYSU: Sun Yat-sen University)H-Index: 2
Last. Yanhua Zhang (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 26
view all 7 authors...
Abstract It has been generally accepted that the Neoproterozoic amalgamation of the Yangtze and Cathaysia Blocks along the Jiangnan orogenic zone created the united South China Block (SCB). However, its final oceanic consumption time and subsequent assemblage process remain controversial. This paper presents a set of new geochronological, geochemical and Sr-Nd-Hf-O isotopic data for the early Neoproterozoic mafic to felsic igneous rocks in the previously-mapped Chencai Group and the associated e...
6 CitationsSource
#1Biji Luo (China University of Geosciences)H-Index: 8
#2Rong LiuH-Index: 1
Last. Hui Shao (China University of Geosciences)H-Index: 1
view all 13 authors...
Abstract Neoproterozoic intrusions are widespread in the northwestern margin of the Yangtze Block, and their petrogenesis was closely related to the assembly and breakup of Rodinia supercontinent. A combined study of zircon U–Pb dating, geochemistry and Sr–Nd–Hf isotopes was carried out for three types of intrusive rocks from the Hannan region, including the Beiba gabbros, the Tianpinghe and Taojiaba I-type granites and the Tiechuanshan and Huangguan A-type granites. LA-ICP-MS zircon U–Pb dating...
7 CitationsSource
#1Mabrouk Sami (Minia University)H-Index: 2
#2Theodoros Ntaflos (University of Vienna)H-Index: 17
Last. A. F. Ahmed (Minia University)H-Index: 5
view all 6 authors...
Abstract Mineral chemistry, whole-rock geochemical and Sr–Nd isotopic data are reported for the Abu-Diab granitoids in the northern Arabian-Nubian Shield (ANS) of Egypt, to investigate their petrogenesis and geodynamic significance. Gabal Abu-Diab constitute a multiphase pluton, consisting largely of two-mica granites (TMGs) enclosing microgranular enclaves and intruded by garnet bearing muscovite granites (GMGs) and muscovite granites (MGs). The granitoids are weakly peraluminous (A/CNK = 1.01–...
7 CitationsSource
#1Yu Li (JLU: Jilin University)H-Index: 9
#2Wen-Liang Xu (JLU: Jilin University)H-Index: 30
Last. Chen-Yang Sun (JLU: Jilin University)H-Index: 3
view all 6 authors...
Abstract This study presents new zircon U–Pb–Hf and whole-rock geochemical data for intrusive rocks in the Xing'an Massif of NE China, with the aim of furthering our understanding of the evolution and spatial influence of the Mongol–Okhotsk tectonic regime. Zircon U–Pb dating indicates that five stages of Mesozoic magmatism are recorded in the Xing'an Massif, namely during the Middle Triassic (~237 Ma), the Late Triassic (~225 Ma), the Early Jurassic (~178 Ma), the Middle Jurassic (~168 Ma), and...
15 CitationsSource
#1Orhan Karsli (Recep Tayyip Erdoğan University)H-Index: 10
#2Faruk Aydin (Karadeniz Technical University)H-Index: 20
Last. Murat Ketenci (ITU: Istanbul Technical University)H-Index: 3
view all 8 authors...
Abstract An integrated study of comprehensive geochronological, geochemical, and Sr-Nd-Hf isotopic data was undertaken for the A-type Topcam pluton that intruded within the Sakarya Zone (NE Turkey) with the aims of elucidating its origin and tectonic significance and gaining new insights into the generation of aluminous A-type granites. New LA-ICP-MS zircon U-Pb crystallization ages of 72 and 73 Ma indicate emplacement in the Late Cretaceous time, just after extensive metaluminous I-type magmati...
10 CitationsSource
Cited By2
Newest
#1Zhen-Dong Tian (CAS: Chinese Academy of Sciences)H-Index: 1
#2Cheng-Biao Leng (CUTe: China University of Technology)
Last. Xing-Chun Zhang (CAS: Chinese Academy of Sciences)H-Index: 11
view all 3 authors...
Abstract The Yidun terrane is located between the Qiangtang terrane and Songpan-Ganzi Fold Belt and its tectonic affinity with other adjacent terrane is of significance to understand the tectonic evolution of southeastern Tibetan Plateau. In this study, we present integrated bulk geochemical data, detrital zircon U-Pb ages and Hf isotopes of meta-sedimentary rocks from the Qiasi Group, which represents the oldest Precambrian basement of the Yidun terrane, to constrain the depositional age and pr...
Source
#1Yu ZhuH-Index: 1
#2Shaocong LaiH-Index: 20
Last. Hang Yang
view all 8 authors...
Abstract High-Mg# (molar 100 × Mg/(Mg + Fe)) diorites can provide significant insights on mantle metasomatism under a subduction zone. Here we investigate the genesis of the Neoproterozoic Shuilu high-Mg# diorites in the western Yangtze Block to evaluate the role of subduction-related fluids and sediment melts acting on mantle sources during the subduction process. Zircon U–Pb dating results display new weighted mean 206Pb/238U ages of 850.1 ± 1.7 Ma, 840.9 ± 2.4 Ma, and 836.6 ± 1.9 Ma for these...
Source
#1Kun Zheng (PKU: Peking University)
#2Cai-Lai WuH-Index: 1
Last. Dong GaoH-Index: 1
view all 6 authors...
Source
#1Yu Zhu (Northwest University (United States))H-Index: 1
#2Shaocong Lai (Northwest University (United States))H-Index: 20
Last. Zezhong Zhang (Northwest University (United States))H-Index: 1
view all 6 authors...
1 CitationsSource
#1Yu Zhu (Northwest University (United States))H-Index: 1
#2Shaocong Lai (Northwest University (United States))H-Index: 20
Last. Shaowei Zhao (Chang'an University)
view all 7 authors...
Abstract Significant widespread melting of the mantle and juvenile mafic lower crust is known to have occurred along the western margin of the Yangtze Block during the Neoproterozoic, but melting of the mature continental crust remains poorly understood. Peraluminous granites can provide vital insights on the reworking of mature continental crustal materials. We present zircon U-Pb-Hf isotopic, whole-rock geochemical, and Sr-Nd isotopic data from the Neoproterozoic peraluminous granites in the w...
1 CitationsSource