Zircon chronology and REE geochemistry of granulite xenolith at Hannuoba

Fan, Qicheng; Liu, Ruoxin; Li, Huimin; Li, Ni; Sui, Jianli; Lin, Zhuoran

doi:10.1007/bf02883438

Cited by 75 publications

(27 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The different crust-mantle structures in the NCC may have resulted from different degrees of magma underplating in the western and eastern NCC (Xu Y G, 2007;Huang et al, 2004). Magmatic underplating must have been important in western NCC, because geochronologic studies (Wilde et al, 2003;Fan et al, 1998) reveal that magma underplating occurred during the Late Mesozoic, coeval with the initiation of widespread thermo-tectonic reactivation of the NCC (Xu Y G, 2001;Griffin et al, 1998). In contrast, underplating was minor in eastern NCC given the pre-dominant "Proterozoic age" of the granulite xenoliths and the coincidence of the "petrologic" and "seismic" Mohos (Huang et al, 2004).…”

Section: North Chinamentioning

confidence: 99%

Thermal state and structure of the lithosphere beneath eastern China: A synthesis on basalt-borne xenoliths

Huang

2010

J. Earth Sci.

View full text Add to dashboard Cite

Application of reliable thermobarometer on garnet-bearing mantle xenoliths and granulite xenoliths entrained by Cenozoic basalts in eastern China reveals two main types of geotherm. The first type, as exampled by Hannuoba (汉诺坝), Mingxi (明溪) and probably Northeast China, is characterized by constant slope of data in the P-T space. The second type, as exampled by the high geotherms of Nüshan (女山) and probably Xinchang (新昌), is characterized by variable slopes, with the samples with pressure <2 MPa defining a slow slope, whereas the samples with pressure >2 MPa define a virtually vertical slope. The different slopes in the second type of geotherm may correspond to different heat transfer mechanisms, with conductive transfer for the shallow upper mantle and advective transfer for the deep mantle. This observed transition in thermal transfer mechanism is consistent with theoretical modeling. The two types of geotherm are not mutually exclusive, because the second type may characterize the thermal state of whole lithospheric section including both mechanical boundary layer (MBL) and thermal boundary layer (TBL), while the first type may only depict the MBL. The variable geotherms for different regions are indicative of a heterogeneous lithospheric structure in eastern China. (a) Eastern North China craton (NCC) is characterized by a second-type geotherm, corresponding to a thin lithosphere (~70 km). Comparison of the equilibrium temperatures of spinel peridotites with this geotherm constrains the depth to Moho in eastern North China craton to be 30 km. In contrast, western NCC (Hannuoba: the first-type geotherm) possesses a relatively low thermal gradient, indicative of a thick lithosphere (>90-100 km) and a thick crust-mantle transition zone. The dramatic change in crustal and mantle structure across the DTGL (Daxing'anling (大兴安岭)-Taihangshan (太行山) gravity lineament) is consistent with recent seismic studies. (b) There is a decrease in thermal gradient and in lithospheric thickness from the coast (Xinchang: the second-type geotherm) to the inland (Mingxi: the first-type geotherm) in South China (from ~80 km to >90 km), which is collaborated with westward variation in basalt geochemistry. (c) The weak convex-upward pattern of the geotherm in Qilin (麒麟) and Leizhou (雷州) Peninsula is peculiar, probably reflecting a transiHuang Xiaolong and Xu Yigang 712 tional feature between conductive and advective heat transfer. It may result from impregnation of mantle plume on the base of the lithosphere. These new results not only provide a basic framework for the ongoing 4-D lithosphere mapping project in eastern China, but also yield important implications for deep processes that operated over the past.

show abstract

Section: North Chinamentioning

confidence: 99%

Thermal state and structure of the lithosphere beneath eastern China: A synthesis on basalt-borne xenoliths

Huang

2010

J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Thus they were derived from the outside. We have undertaken lots of studies on Archean granulite terrain on the North China Craton and granulite xenoliths entrained in Cenozoic volcanic rocks recently and the results show that magma underplating and crust-mantle interaction occurred in Mesozoic on the North China Craton [10,11] . Studies on the mantle xenocrysts from Mesozoic Fangcheng basalts show the reconstruction could be accomplished through the peridotite-crustal melt interaction [12] .…”

Section: Discussionmentioning

confidence: 99%

Si-and alkali-rich melt inclusions in minerals of mantle peridotites from eastern China: Implication for lithospheric evolution

Fan

Sui

et al. 2006

SCI CHINA SER D

Self Cite

View full text Add to dashboard Cite

Minerals of spinel-and garnet-facies mantle xenoliths entrained in Cenozoic basalts from eastern China (North China, Northeastern China and Southeastern China coastal area) contains lots of melt inclusions. Studies on these melt inclusions show that the glass inclusions are rich in SiO 2 (60%-68%) and alkalis (K 2 O+Na 2 O＝5%-11%, especially for K 2 O) as well as volatiles such as H 2 O and CO 2 (2%-7%), which belong to dacites and andesites of the high-K calcic alkali series rocks with few shoshonites. High Al and Ca diopside in melt inclusion is the product of melt crystallization at high temperature and pressure, rather than the product of devitrification. Results show that these K-rich (in general K 2 O>3%) intermediate-acidic silicate melt inclusions have characteristics of continent without a genetical link to host basalts and their phenocrystic minerals. Thus, these trapped melt inclusions represent melts of Mesozoic lithospheric mantle-crust interaction and imply that the continental lithospheric mantle beneath eastern China had undergone fragmentation and recreation processes during the Mesozoic and Cenozoic periods. This result undoubtly provides important implication for the evolution of sub-continental lithosphere beneath eastern China. We propose that these Si-and alkalis-rich melts should be responsible for the mantle chemical heterogeneity underneath eastern China.

show abstract

“…The mafic-ultramafic crustmantle transitional zone has the typical cumulate structure and is dated at 120-140 Ma (zircon U-Pb age for a Cenozoic basalt-borne xenolith) (Fan et al, 1998), which is similar to that of the plutonic rocks in North Taihang. This reveals intensive underplating of mantlederived Fig.…”

Section: Metallogenic Significancesmentioning

confidence: 99%

Significance of quartz REE geochemistry, Shihu gold deposit, western Hebei Province, North China, using LA-ICP-MS

Cao

Yao

et al. 2010

Front. Earth Sci. China

View full text Add to dashboard Cite

Rare earth element (REE) geochemistry on monomineral has been widely used in various fields of geosciences to reveal the origin of ore-forming materials and fluid. Quartz are ubiquitous mineral in the Shihu gold deposit that is situated in central shear zone of mesocenozoic Fuping metamorphic core complex in the middlenorthern part of Taihang Mountains. Gold-bearing quartz veins are their most important industrial orebodies. Rare earth element abundances in quartz from the Shihu gold mine, as determined by laser ablation-indutively coupled plasma-mass spectrometry (LA-ICP-MS) analysis, are shown to be sensitive to identify barren quartz and mineralized quartz. Amounts of REE concentrations in barren quartz and mineralized quartz are 97 Â 10 -9 and 85 Â 10 -9 , respectively. The average (La/Yb) N and (La/Sm) N ratios for the barren quartz are 0.25 and 0.13, and the ratios for mineralized quartz are 0.28 and 0.19, respectively. There is a pronounced positive correlation between (La/ Yb) N and (La/Sm) N ratios. There is no obvious correlation between REE characteristics and sampling sites. The mineralized quartz show the most pronounced negative Ce anomalies, whereas weak negative Ce anomalies are typical of barren quartz vein. A negative Eu anomaly becomes more significant in mineralized quartz than barren quartz. δCe have a broadly positive correlation with δEu. Y/Ho ratio of barren quartz and mineralized quartz are ranging from 2.14-28.75, and from 1.28-9.92, respectively. The REE characteristics of quartz indicate that the ore-forming fluids of the gold deposit were derived from the deep fluid and its formation was dually controlled by Precambrian metamorphic basement and Mesozoic granitoids. The results significantly enhance the usefulness of quartz in tracing the sources of ore-forming fluid to discuss the genesis of the gold deposit, and as an indicator mineral in mineral exploration in Taihang mountain region.

show abstract

Zircon chronology and REE geochemistry of granulite xenolith at Hannuoba

Cited by 75 publications

References 4 publications

Thermal state and structure of the lithosphere beneath eastern China: A synthesis on basalt-borne xenoliths

Thermal state and structure of the lithosphere beneath eastern China: A synthesis on basalt-borne xenoliths

Si-and alkali-rich melt inclusions in minerals of mantle peridotites from eastern China: Implication for lithospheric evolution

Significance of quartz REE geochemistry, Shihu gold deposit, western Hebei Province, North China, using LA-ICP-MS

Contact Info

Product

Resources

About