Lower time limit on the UHPM rock exhumation: Discovery of eclogite pebbles in the Late Jurassic conglomerates from the northern foot of the Dabie Mountains, eastern China

2002 ◽  
Vol 47 (3) ◽  
pp. 231 ◽  
Author(s):  
Daoxuan WANG
Keyword(s):  
Late Jurassic ◽  
Eastern China ◽  
Time Limit ◽  
Dabie Mountains

Tectonic Framework and Evolution of the Dabie Mountains in Anhui, Eastern China

2009 ◽  
Vol 5 (3) ◽  
pp. 221-238 ◽  
Author(s):  
Xu Shutong ◽  
Jiang Laili ◽  
Liu Yican ◽  
Zhang Yong
Keyword(s):  
Eastern China ◽  
Dabie Mountains ◽  
Tectonic Framework

Microdiamonds, their classification and tectonic implications for the host eclogites from the Dabie and Su-Lu regions in central eastern China

2005 ◽  
Vol 69 (4) ◽  
pp. 509-520 ◽  
Author(s):  
Shutong Xu ◽  
Yican Liu ◽  
Guanbao Chen ◽  
Shouyuan Ji ◽  
Pei Ni ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Eastern China ◽  
Dabie Mountains ◽  
Thin Sections ◽  
The North ◽  
First Occurrence ◽  
Metamorphic Terrane ◽  
Central Eastern ◽  
Mixed Types

AbstractWe have found >10 in situ microdiamonds in thin sections of eclogites from the Dabie and Su-Lu regions of central eastern China since the first occurrence of microdiamond in eclogites from the Dabie Mountains (DMT) reported in 1992. The microdiamonds are found not only in the central part but also in the northern part of the DMT. Several free crystals have been recovered from the crushed eclogites from the central DMT. Most in situ microdiamonds are inclusions in garnets but a few larger ones are intergranular. Most of the diamondiferous eclogites in the central part of the DMT are associated with coesite. Most importantly, the observation of microdiamonds in northern Dabie lead us to question the supposition that this is a low-P metamorphic terrane. All the diamondiferous eclogites from both the north and central DMT are of continental affinity as demonstrated by their negative εNd values. Therefore, both the north and central eclogite belts in the DMT are considered to be from the deep subducted terrane. Five in situ microdiamonds and two free crystals are first reported in this paper. The dimensions of the in situ microdiamonds are 30–180 µm and the free crystals are up to 400–700 mm across. All the microdiamonds are confirmed as such by Raman spectroscopy. The results of an infrared spectroscopic investigation on two larger free crystals and two in situ microdiamonds show that all the microdiamonds from both the Dabie and Su-Lu regions are mixed types IaA and IaB diamonds and there is no indication of any synthetic microdiamonds in our samples because such synthetic microdiamonds are always rich in type Ib.

Late Jurassic, high Ba–Sr Linglong granites in the Jiaodong Peninsula, East China: lower crustal melting products in the eastern North China Craton

2017 ◽  
Vol 155 (5) ◽  
pp. 1040-1062 ◽  
Author(s):  
LI-QIANG YANG ◽  
YILDIRIM DILEK ◽  
ZHONG-LIANG WANG ◽  
ROBERTO F. WEINBERG ◽  
YUE LIU
Keyword(s):  
North China Craton ◽  
Late Jurassic ◽  
North China ◽  
Eastern China ◽  
Ultrahigh Pressure ◽  
Granitic Rocks ◽  
Crustal Melting ◽  
Heavy Rare Earth Element ◽  
The North ◽  
Lower Crustal

AbstractThe Jurassic Linglong granites, intrusive into the North China Craton (NCC) in eastern China, provide a critical record of the first major episode of lithospheric-scale extension and magmatism in NE China during Mesozoic time. Our U–Pb zircon dating reveals that the Linglong granites were emplaced during 161–158 Ma, shortly after the inception of a shallow subduction of the Palaeo-Pacific plate beneath East Asia during Middle Jurassic time. These granites have high alkali contents (K2O + Na2O = 8–9 wt%), low MgO and Mg no. values and variable Cr–Ni abundances. Their relatively high Ba and Sr concentrations, relatively low heavy rare Earth element (HREE) and strongly fractionated REE patterns characterize them as high Ba–Sr granites. The negative whole-rock εNd(t) values ranging from −22.4 to −10.9 and wide-ranging zircon εHf(t) values of −39.1 to −1.5 suggest that magmas of the Linglong granites were produced by partial melting of a garnet-amphibolite-bearing lower crust of the Jiaobei Terrane and by re-melting of the Triassic ultrahigh-pressure (UHP) metamorphic rocks and alkaline suites of the Sulu Terrane. The occurrence in the granitic rocks of inherited zircons of the Neoarchaean, Palaeoproterozoic, Neoproterozoic, Palaeozoic and Triassic ages suggests that magmas of the Linglong granites interacted with the ancient crust in these terranes during their ascent. Asthenospheric upwelling, induced by the steepening and rapid rollback of the Palaeo-Pacific slab during Late Jurassic time, provided the heat source for the inferred lower crustal melting. Trench migration and thermal weakening of the crust caused extensional deformation and thinning in the eastern part of the NCC.

Contrasting origins of late Mesozoic adakitic granitoids from the northwestern Jiaodong Peninsula, east China: implications for crustal thickening to delamination

2007 ◽  
Vol 144 (4) ◽  
pp. 619-631 ◽  
Author(s):  
MING-LAN HOU ◽  
YAO-HUI JIANG ◽  
SHAO-YONG JIANG ◽  
HONG-FEI LING ◽  
KUI-DONG ZHAO
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
Early Stage ◽  
Eastern China ◽  
Alkali Feldspar ◽  
Crustal Thickening ◽  
Geochemical Data ◽  
Jiaodong Peninsula ◽  
T Values ◽  
Lower Crustal

Two suites of granitoids, the Late Jurassic (158 ± 3 Ma) Linglong suite and the Early Cretaceous (130–126 Ma) Guojialing suite, crop out in the northwestern Jiaodong Peninsula, eastern China. The Linglong suite is a monzogranite, comprising alkali feldspar, plagioclase, quartz and Fe-rich biotite. The Guojialing suite includes at least five plutonic bodies of both granodiorite and monzo-granite. The rocks are composed of plagioclase, alkali feldspar, quartz, Mg-rich amphibole and Mg-rich biotite. Both the Linglong and Guojialing suites have adakitic affinity. They are enriched in LREE with high La/Yb ratios and show positive Eu anomalies. The rocks are also enriched in LILE and depleted in HFSE with high Sr/Y ratios. The Linglong granite shows very uniform Sr–Nd isotopic compositions with initial 87Sr/86Sr ratios of 0.7119–0.7126 and εNd (T) values of −21.3 to −21.6, which are similar to those of the local Neoarchaean basement. The Guojialing suite has variable initial 87Sr/86Sr ratios (0.7108–0.7120) and εNd (T) values (−10.8 to −17.2), which are distinct both from those of the Neoarchaean basement and from those of the local enriched lithospheric mantle inferred from the coeval mafic dykes in the studied area. Detailed petrological and geochemical data indicate that the Linglong suite was derived by partial melting of Neoarchaean metamorphic lower-crustal rocks at depth of > 50 km with a eclogite residue, whereas the Guojialing suite was formed by the reaction of delaminated eclogitic crust-derived melt with the upwelling asthenospheric mantle. The petrogenesis of these two contrasting adakitic granitoids suggests intensive lower-crustal delamination during Early Cretaceous times, following a crustal thickening process from the late stage of the Early Jurassic to early stage of the Late Jurassic with crustal thickness of < 32 km to > 50 km, respectively.

Hydrolytic weakening of jadeite in UHP jadeite-quartzites from the Dabie Mountains, eastern China

2006 ◽  
Vol 70 (5) ◽  
pp. 509-515 ◽  
Author(s):  
Wen Su ◽  
Kai Ye ◽  
Jingbo Liu
Keyword(s):  
Plastic Deformation ◽  
Eastern China ◽  
Dislocation Creep ◽  
Dabie Mountains ◽  
Dislocation Loops ◽  
Transmission Electron ◽  
Dislocation Arrays ◽  
Show Evidence ◽  
Electron Energy Loss ◽  
Dislocation Walls

AbstractDeformed jadeite grains in the UHP jadeite-quartzites from the Dabie Mountains, eastern China show evidence (by transmission electron microscopy, TEM) of plastic deformation: free dislocations, dislocation loops, dislocation networks, dislocation arrays and regularly spaced subgrain boundaries by dislocation walls. Electron energy-loss spectroscopy and TEM studies reveal the existence of water-rich bubbles within dislocations and imply a relationship with water-defect dislocation by water weakening in the jadeites. These observations suggest that the water-rich bubbles are a major weakening effect facilitating plastic deformation of jadeite by dislocation creep.

Role of Water in Deformed Omphacite in UHP Eclogite from the Dabie Mountains, Eastern China

2003 ◽  
Vol 77 (3) ◽  
pp. 320-325 ◽  
Author(s):  
SU Wen ◽  
YOU Zhendong ◽  
CONG Bolin ◽  
YE Kai
Keyword(s):  
Eastern China ◽  
Dabie Mountains

scholarly journals A new species of Rana from the Dabie Mountains in eastern China (Anura, Ranidae)

ZooKeys ◽  
2017 ◽  
Vol 724 ◽  
pp. 135-153 ◽  
Author(s):  
Chencheng Wang ◽  
Lifu Qian ◽  
Chenling Zhang ◽  
Weibo Guo ◽  
Tao Pan ◽  
...  
Keyword(s):  
New Species ◽  
Eastern China ◽  
Dabie Mountains ◽  
A New Species
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