scholarly journals Supplemental Material: Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans–North China orogen

2020 ◽  
Author(s):  
Lingchao He ◽  
Jian Zhang ◽  
et al.
Keyword(s):  
Shear Zone ◽  
Inductively Coupled Plasma ◽  
Mineral Content ◽  
North China ◽  
Microstructural Analysis ◽  
Ductile Shear Zone ◽  
Inductively Coupled ◽  
High Pressure Granulite ◽  
Plasma Mass Spectrometry ◽  
Ductile Shear

Table S1: Checked mineral content and grain size of EBSD samples; Table S2: Representative compositional analyses of minerals; Table S3: Zircon U-Pb isoplot data obtained by laser ablation–inductively coupled plasma–mass spectrometry for samples 17HS06-1 and 14630-1 from Zhujiafang; Table S4: Summary of isotopic ages for the high-pressure granulite of the Trans–North China orogen and Zhujiafang ductile shear zone.

scholarly journals Supplemental Material: Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans–North China orogen

2020 ◽  
Author(s):  
Lingchao He ◽  
Jian Zhang ◽  
et al.
Keyword(s):  
Shear Zone ◽  
Inductively Coupled Plasma ◽  
Mineral Content ◽  
North China ◽  
Microstructural Analysis ◽  
Ductile Shear Zone ◽  
Inductively Coupled ◽  
High Pressure Granulite ◽  
Plasma Mass Spectrometry ◽  
Ductile Shear

Table S1: Checked mineral content and grain size of EBSD samples; Table S2: Representative compositional analyses of minerals; Table S3: Zircon U-Pb isoplot data obtained by laser ablation–inductively coupled plasma–mass spectrometry for samples 17HS06-1 and 14630-1 from Zhujiafang; Table S4: Summary of isotopic ages for the high-pressure granulite of the Trans–North China orogen and Zhujiafang ductile shear zone.

scholarly journals Supplemental Material: Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans–North China orogen

2020 ◽  
Author(s):  
Lingchao He ◽  
Jian Zhang ◽  
et al.
Keyword(s):  
Shear Zone ◽  
Inductively Coupled Plasma ◽  
Mineral Content ◽  
North China ◽  
Microstructural Analysis ◽  
Ductile Shear Zone ◽  
Inductively Coupled ◽  
High Pressure Granulite ◽  
Plasma Mass Spectrometry ◽  
Ductile Shear

Table S1: Checked mineral content and grain size of EBSD samples; Table S2: Representative compositional analyses of minerals; Table S3: Zircon U-Pb isoplot data obtained by laser ablation–inductively coupled plasma–mass spectrometry for samples 17HS06-1 and 14630-1 from Zhujiafang; Table S4: Summary of isotopic ages for the high-pressure granulite of the Trans–North China orogen and Zhujiafang ductile shear zone.

Macro- and microstructural analysis of the Zhujiafang ductile shear zone, Hengshan Complex: Tectonic nature and geodynamic implications of the evolution of Trans−North China orogen

2020 ◽  
Author(s):  
Lingchao He ◽  
Jian Zhang ◽  
Guochun Zhao ◽  
Changqing Yin ◽  
Jiahui Qian ◽  
...  
Keyword(s):  
Shear Zone ◽  
North China ◽  
Shear Zones ◽  
Crustal Thickening ◽  
Slip Systems ◽  
High Grade ◽  
Ductile Shear Zone ◽  
Crustal Rocks ◽  
Ductile Shear ◽  
Lower Crustal

In worldwide orogenic belts, crustal-scale ductile shear zones are important tectonic channels along which the orogenic root (i.e., high-grade metamorphic lower-crustal rocks) commonly experienced a relatively quick exhumation or uplift process. However, their tectonic nature and geodynamic processes are poorly constrained. In the Trans−North China orogen, the crustal-scale Zhujiafang ductile shear zone represents a major tectonic boundary separating the upper and lower crusts of the orogen. Its tectonic nature, structural features, and timing provide vital information into understanding this issue. Detailed field observations showed that the Zhujiafang ductile shear zone experienced polyphase deformation. Variable macro- and microscopic kinematic indicators are extensively preserved in the highly sheared tonalite-trondhjemite-granodiorite (TTG) and supracrustal rock assemblages and indicate an obvious dextral strike-slip and dip-slip sense of shear. Electron backscattered diffraction (EBSD) was utilized to further determine the crystallographic preferred orientation (CPO) of typical rock-forming minerals, including hornblende, quartz, and feldspar. EBSD results indicate that the hornblendes are characterized by (100) <001> and (110) <001> slip systems, whereas quartz grains are dominated by prism <a> and prism <c> slip systems, suggesting an approximate shear condition of 650−700 °C. This result is consistent with traditional thermobarometry pressure-temperature calculations implemented on the same mineral assemblages. Combined with previously reported metamorphic data in the Trans−North China orogen, we suggest that the Zhujiafang supracrustal rocks were initially buried down to ∼30 km depth, where high differential stress triggered the large-scale ductile shear between the upper and lower crusts. The high-grade lower-crustal rocks were consequently exhumed upwards along the shear zone, synchronous with extensive isothermal decompression metamorphism. The timing of peak collision-related crustal thickening was further constrained by the ca. 1930 Ma metamorphic zircon ages, whereas a subsequent exhumation event was manifested by ca. 1860 Ma syntectonic granitic veins and the available Ar-Ar ages of the region. The Zhujiafang ductile shear zone thus essentially record an integrated geodynamic process of initial collision, crustal thickening, and exhumation involved in formation of the Trans−North China orogen at 1.9−1.8 Ga.

A Palaeoarchean–Mesoarchean micro-continent entrained in the Jiao-Liao-Ji Belt at the southeastern North China Craton: evidence from the zircon record in the Bengbu area

2019 ◽  
Vol 156 (9) ◽  
pp. 1565-1586 ◽  
Author(s):  
Chaohui Liu ◽  
Guochun Zhao ◽  
Fulai Liu ◽  
Jia Cai
Keyword(s):  
Trace Element ◽  
North China Craton ◽  
Inductively Coupled Plasma ◽  
North China ◽  
Detrital Zircons ◽  
Magmatic Zircon ◽  
Inductively Coupled ◽  
Multi Stage ◽  
Plasma Mass Spectrometry ◽  
Trace Element Contents

AbstractThe Bengbu area in the southeastern North China Craton (NCC) consists predominantly of Archean–Palaeoproterozoic (gneissic) granitoids with minor supracrustal rocks (the Fengyang and Wuhe groups). This study presents new zircon laser ablation – inductively coupled plasma – mass spectrometry U–Pb and Lu–Hf isotopic data and trace-element contents for these granitoids, which improve understanding the Archean–Palaeoproterozoic crustal evolution of the NCC. Magmatic zircon U–Pb data reveal that zircons in the (gneissic) granitoids were generated by multi-stage events at 2.93, 2.73, 2.53–2.52 and 2.18–2.13 Ga. Metamorphic zircon U–Pb data obtained from these rocks show two distinct metamorphic ages of 2.49–2.52 and 1.84 Ga, suggesting that the Bengbu area experienced a regional metamorphic event at the end of the Neoarchean Era and encountered reworking by a tectonothermal event associated with the formation of the Palaeoproterozoic Jiao-Liao-Ji Belt. Trace-element compositions of magmatic zircons reveal the highest Ti concentrations (8.08±3.38 ppm) and growth temperatures (718±44 °C) for the zircons aged 2.13–2.17 Ga and an increase in zircon U/Yb ratios from 2.93 Ga (0.34±0.12) through 2.73 Ga (0.96±0.42) to 2.53 Ga (1.05±0.46), but an evident decrease at 2.17–2.13 Ga (0.61±0.40 ppm). Similar Palaeoarchean xenocrystic and detrital zircons with negativeɛHf(t) values, late Mesoarchean magmatic zircons with juvenile Hf isotopic features, early Neoarchean magmatic zircons with model ages of 2.9–3.0 Ga, and two regional metamorphic events at 2.52–2.48 and 1.88–1.80 Ga in the Bengbu and Jiaobei areas indicate a Palaeoarchean–Mesoarchean micro-continent entrained in the Jiao-Liao-Ji Belt at the southeastern NCC.

Two Paleoproterozoic metamorphic events in the Zhujiafang ductile shear zone of the Hengshan Complex: Insights into the tectonic evolution of the North China Craton

2020 ◽  
Author(s):  
Jiahui Qian
Keyword(s):  
Shear Zone ◽  
North China Craton ◽  
Tectonic Evolution ◽  
North China ◽  
Shear Zones ◽  
Ductile Shear Zone ◽  
Garnet Amphibolite ◽  
Inclusion Type ◽  
Mineral Assemblages ◽  
Ductile Shear

<p>Ductile shear zones <span>usually record mineralogical and isotopic changes that are not apparent in the surrounding host rocks and thus may preserve a complete evolutionary record in a single locale from relatively undeformed to highly deformed rocks. </span>The Zhujiafang ductile shear zone is situated in the central Hengshan Complex, a key area for understanding the Paleoproterozoic tectonic evolution of the Trans-North China Orogen, North China Craton. Detailed metamorphic and geochronological analyses were carried out on metapelite and garnet amphibolite from the Zhujiafang ductile shear zone. The metapelite preserves two phases of mineral assemblages: early kyanite-rutile-bearing assemblage and late chlorite-staurolite-bearing assemblage in garnet–mica schist, and inclusion-type muscovite (high-Si) + kyanite assemblage and late sillimanite-bearing assemblage in sillimanite–mica gneiss. Garnet in the metapelite occasionally exhibits pronounced two-stage zoning characteristic of a diffusion core with irregular pyrope (X<sub>py</sub>) and grossular (X<sub>gr</sub>) contents and a growth rim with X<sub>py</sub> and X<sub>gr</sub> increasing outwards. The isopleths of the maximum X<sub>gr</sub> in garnet core and Si content in inclusion-type muscovite in the P–T pseudosections suggest that the early mineral assemblages underwent medium-high-pressure type metamorphism with pressures up to 12–14 kbar at 700–750 °C. The late assemblages and the growth zoning of garnet rim predict a late separated clockwise P–T path with peak conditions of 6.5 ± 0.2 kbar/620 ± 10 °C (medium-low-pressure type). The garnet amphibolite is mainly composed of garnet, hornblende, plagioclase, ilmenite and quartz, without overprinting of late mineral assemblages except for localized corona textures. Phase modeling suggests that the rock has experienced high-amphibolite facies metamorphism with peak conditions of 10.5 ± 0.8 kbar/770 ± 50 °C, which is broadly consistent with the early-phase metamorphism of metapelite. Zircon U–Pb dating on metapelite yields two metamorphic age groups of 1.96–1.92 Ga and 1.87–1.86 Ga which are interpreted to represent the timing of the two separated phases of metamorphism. Two separated orogenic events may have occurred respectively at ~1.95 Ga and ~1.85 Ga in the Hengshan–Wutai area. The older orogeny was resulted from continental collision and the younger one may be caused by within-plate deformation. The final exhumation of the high-grade rocks formed in the older (i.e. 1.95 Ga) orogeny should be related with the younger deformation/metamorphic event. For more details, please refer to <span>https://doi.org/10.1016/j.lithos.2019.02.001.</span></p>

scholarly journals Provenance analysis of the Late Triassic Yichuan Basin: constraints from zircon U-Pb geochronology

2018 ◽  
Vol 10 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Xianghong Meng ◽  
Yu Zhang ◽  
Duoyun Wang ◽  
Xue Zhang
Keyword(s):  
North China Craton ◽  
Inductively Coupled Plasma ◽  
North China ◽  
Detrital Zircons ◽  
Late Triassic ◽  
Provenance Analysis ◽  
Qinling Orogen ◽  
Inductively Coupled ◽  
The North ◽  
Plasma Mass Spectrometry

AbstractLaser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb dating has been performed on detrital zircons from the Chunshuyao Formation sandstone of Yichuan Basin. The ages of 85 detrital zircon grains are divided into three groups: 252-290 Ma, 1740-2000 Ma, and 2400-2600 Ma. The lack of Early Paleozoic and Neoproterozoic U-Pb ages indicates that there is no input from the Qinling Orogen, because the Qinling Orogen is characterized by Paleozoic and Neoproterozoic material. In combination with previous research, we suggest that the source of the Chunshuyao Formation is most likely recycled from previous sedimentary rocks from the North China Craton. In the Late Triassic, the Funiu ancient land was uplifted which prevented source material from the Qinling Orogen. Owing to the Indosinian orogeny, the strata to the east of the North China Craton were uplifted and eroded. The Yichuan Basin received detrital material from the North China Craton.

scholarly journals ICP–MS Analysis of Multi-Elemental Profile of Greek Wines and Their Classification According to Variety, Area and Year of Production

Separations ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 119
Author(s):  
Konstantina Pasvanka ◽  
Marios Kostakis ◽  
Maria Tarapoulouzi ◽  
Pavlos Nisianakis ◽  
Nikolaos S. Thomaidis ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Mineral Content ◽  
Statistical Investigation ◽  
Multivariate Statistical ◽  
Annual Fluctuation ◽  
Inductively Coupled ◽  
Elemental Profile ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
And Cluster Analysis

Major, minor and trace elements in wines from Greece were determined by inductively coupled plasma–mass spectrometry (ICP–MS). The concentrations of 44 elements (Na, Mg, P, K, Ca, Cu, Co, Cr, Zn, Sn, Fe, Mn, Li, Be, B, V, Sr, Ba, Al, Ag, Ni, As, Sn, Hg, Pb, Sb, Cd, Ti, Ga, Zr, Nb, Pd, Te, La, Sm, Ho, Tm, Yb, W, Os, Au, Tl, Th, U) in 90 white and red wines from six different regions in Greece for two consecutive vinification years, 2017 and 2018, were determined. Results for the elements aforementioned were evaluated by multivariate statistical methods, such as discriminant analysis and cluster analysis, and the wines were discriminated according to wine variety and geographical origin. Due to the specific choice of the analytes for multivariate statistical investigation, a prediction rate by cross-validation of 98% could be achieved. The aim of this study was not only to reveal specific relationships between the wine samples or between the chemical variables in order to classify the wines from different regions and varieties according to their elemental profile (wine authentication), but also to observe the annual fluctuation in the mineral content of the studied wine samples.

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