Geochemical characteristics and zircon U-Pb isotopic ages of island-arc basic igneous complexes from the Tianshui area in West Qinling

2007 ◽  
Vol 1 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Xianzhi Pei ◽  
Zuochen Li ◽  
Huibin Liu ◽  
Gaoyang Li ◽  
Saping Ding ◽  
...  
Keyword(s):  
Island Arc ◽  
Geochemical Characteristics ◽  
West Qinling ◽  
Igneous Complexes

The LA-ICP-MS zircons U-Pb ages and geochemistry of the Baihua basic igneous complexes in Tianshui area of West Qinling

2007 ◽  
Vol 50 (S2) ◽  
pp. 264-276 ◽  
Author(s):  
XianZhi Pei ◽  
SaPing Ding ◽  
GuoWei Zhang ◽  
HuiBin Liu ◽  
ZuoChen Li ◽  
...  
Keyword(s):  
West Qinling ◽  
Icp Ms ◽  
Igneous Complexes

The Lead Isotope Characteristics and Tracing Significance of Ore Metallogenic Material in the Geza Arc,Yunnan

2014 ◽  
Vol 1073-1076 ◽  
pp. 2054-2057
Author(s):  
Xue Long Liu ◽  
Na Zhang ◽  
Jian Kang
Keyword(s):  
Lower Crust ◽  
Lead Isotope ◽  
Development Stage ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Pb Isotopes ◽  
Isotopic Data ◽  
Porphyry Deposits ◽  
Intrusive Rocks ◽  
Polymetallic Ore

Geza arc is the important parts of Yidun island arc in southwest of Sanjiang tectonic magmatic belts, it located in the southern tip of the Yidun island arc, which is a newly discovered copper polymetallic ore concentration area in the recently years in China. Based on the development stage of island arc orogenic, the distribution of intrusive rocks, composition, geochemical characteristics, Geza island arc granits belt can be divided into three belts. Geza island arc several typical porphyry deposits Pb isotopic data show that Pb206/Pb204 17.680~19.165, Pb207/Pb204 15.453~15.773,change in scope, Pb208/Pb204 37.730~39.654. Most of samples are normal lead, Pb isotopes focused on the side of orogenic evolution line and the lower crust range,with the characteristics of crust-mantle mixed source.

Petrography and geochemical characteristics of Chang 7 sandstone in Yanhe profile, Ordos Basin: Implication for paleoenvironment and tectonic background

2020 ◽  
Vol 8 (4) ◽  
pp. T981-T990
Author(s):  
Haijun Gao ◽  
Delu Li ◽  
Dingming Dong ◽  
Hongjun Jing ◽  
Hao Tang
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Ordos Basin ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Grain Size Analysis ◽  
Alkaline Basalt

The Chang 7 oil layer from the upper Triassic Yanchang Formation is an important layer for hydrocarbon exploration. Most studies on the Chang 7 oil layer have focused on the source rocks, while research on the sandstone is still inadequate, especially on the petrography and geochemical characteristics. Using seven sandstone samples of the Chang 7 oil layer in the Yanhe profile, the grain-size analysis, major elements, trace elements, and rare earth elements were tested. The results find that the sandstone of fine-grained sediments of the Chang 7 oil layer is dominated by arkose with a minor number of lithic arkose. The range of grain size (Mz) is from 2.72 to 3.92 Φ, and the C value and M value of the sandstone samples suggest characteristics of turbidity deposition. The Al/Si ratios of all of the samples imply high clay mineral content. The results of trace and rare earth elements demonstrate the reducing condition, freshwater, and cold and dry weather. The provenance of the sandstone samples is mainly from island arc acidic volcanic rock, and the type of provenance is mixed with sedimentary rock, granite, and alkaline basalt. The tectonic background is continental island arc. This study provides a systematic geologic foundation for the formation of sandstone of Chang 7 oil layer in Ordos Basin.

Geological and geochemical characteristics and prospecting potential of the Daqiao hot spring-type gold deposit in the west Qinling Orogen

2017 ◽  
Vol 53 ◽  
pp. 136-146 ◽  
Author(s):  
Yunhua Liu ◽  
Yixiao Han ◽  
Juzhen Wei ◽  
Fei Teng ◽  
Runqing Tian ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Hot Spring ◽  
Geochemical Characteristics ◽  
Qinling Orogen ◽  
The West ◽  
West Qinling ◽  
Spring Type ◽  
West Qinling Orogen

scholarly journals Middle paleozoic rhyolite of Gorny and Rudny Altai: geochronology and composition characteristics

2019 ◽  
Vol 487 (5) ◽  
pp. 532-537
Author(s):  
M. L. Kuibida ◽  
V. I. Timkin ◽  
V. A. Krivchikov ◽  
O. V. Murzin ◽  
V. I. Krupchatnikov ◽  
...  
Keyword(s):  
Island Arc ◽  
Geochemical Characteristics ◽  
The West ◽  
Two Stage ◽  
Isotopic Dating ◽  
Gorny Altai ◽  
Middle Paleozoic ◽  
Composition Characteristics

The paper presents the results of geological, geochemical and isotope-geochronological studies of subvolcanic rhyolites of the Western Gorny Altai and Rudny Altai which have related to two large volcanic systems, the Altai-Minusinsk and Altai-Salair, respectively. The results of U-Pb isotopic dating of zircons revealed two groups of ages ~410-405 and 390-381 million years. Isotope-geochemical characteristics of rhyolites show relatively high values of εNd(T) = +2,7...6,0 with relatively young values of model ages T(DM) = 851-966 Ma in the Rudny Altai and more ancient - up to 1266 Ma in the West Gorny Altai. Geochemical characteristics indicate that its composition is consistent with transitional field between within-plate and island-arc felsic magmas. The results obtained correspond to the two-stage evolution of volcanism and its migration from the continent to the ocean.

Geochemical characteristics of island-arc volcanic rocks in the Nan-Nam Pat-Phetchabun zone, northern Thailand

2010 ◽  
Vol 29 (4) ◽  
pp. 337-342 ◽  
Author(s):  
Shangyue Shen ◽  
Qinglai Feng ◽  
Wenqiang Yang ◽  
Zhibin Zhang ◽  
Chongpom Chonglakmani
Keyword(s):  
Volcanic Rocks ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Northern Thailand

scholarly journals New data on age, material composition and geological structure of the Central Kamchatka depression (CKD). Part 1. Rocks types. Age, petrological and isotopo-geochemical characteristicsн

2019 ◽  
pp. 3-24
Author(s):  
A. V. Koloskov ◽  
M. Yu. Davydova ◽  
D. V. Kovalenko
Keyword(s):  
Characteristic Feature ◽  
Alkaline Rock ◽  
Geological Structure ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Aleutian Island ◽  
Shield Volcano ◽  
Asthenospheric Mantle ◽  
Mantle Reservoir ◽  
Central Kamchatka Depression

The paper presents new age and isotope geochemical characteristics for plateau effusive rocks from the Central Kamchatka Depression (CKD) and Nikolka Volcano. We compared these data with the data on rocks from the Klyuchevskoy group of volcanoes and also Sheveluch, Kharchinsky, Zarechny, Nachikinsky, Bakening volcanoes and NEB-adakites from Pliocene shield volcano between the Ozernaya Kamchatka and Pravaya Kamchatka rivers. It is shown that the evolutionally advanced (often more alkaline) rock from Nachikinsky, Bakening, Nikolka volcanoes and the Pliocene shield volcanoe significantly differ in isotope-geochemical characteristics from the Klyuchevskoy group of volcanoes rocks. Exactly this type of rocks is characteristic for CKD as rift structure. The Klyuchevskoy group of volcanoes rock are not typomorphic for this structure and manifest the usual orogenic volcanism stage, typical for much larger area. Miocene plateau effusive rocks differ from rocks of this group only by slightly increased potassium alkalinity. The rift type rocks characteristic feature is not only their increased alkalinity, but also specific microcomponents ratios: Ti/V > 0.004, Nb/Y > 0.28, Dy/Yb > 2.00, La/Yb > 6.5, Sm/Yb > 2.4, Lu/Hf < 0.08. Along with isotopic characteristics, these ratios suggest the existence of the single deep asthenospheric mantle reservoir for initial melts. The Kurile-Kamchatka and Commander-Aleutian island-arc systems’ junction is marked by the increased fluid enrichment (Ce group of REE) of melts for rocks of certain volcanoes: Shiveluch, Kharchinsky, Zarechny.

scholarly journals New data on age, material composition and geological structure of the Central Kamchatka depression (CKD). Part 1. Rocks types. Age, petrological and isotopo-geochemical characteristicsн

2019 ◽  
pp. 3-24
Author(s):  
A. V. Koloskov ◽  
M. Yu. Davydova ◽  
D. V. Kovalenko ◽  
V. V. Ananyev
Keyword(s):  
Characteristic Feature ◽  
Alkaline Rock ◽  
Geological Structure ◽  
Island Arc ◽  
Geochemical Characteristics ◽  
Aleutian Island ◽  
Shield Volcano ◽  
Asthenospheric Mantle ◽  
Mantle Reservoir ◽  
Central Kamchatka Depression

The paper presents new age and isotope geochemical characteristics for plateau effusive rocks from the Central Kamchatka Depression (CKD) and Nikolka Volcano. We compared these data with the data on rocks from the Klyuchevskoy group of volcanoes and also Sheveluch, Kharchinsky, Zarechny, Nachikinsky, Bakening volcanoes and NEB-adakites from Pliocene shield volcano between the Ozernaya Kamchatka and Pravaya Kamchatka rivers. It is shown that the evolutionally advanced (often more alkaline) rock from Nachikinsky, Bakening, Nikolka volcanoes and the Pliocene shield volcanoe significantly differ in isotope-geochemical characteristics from the Klyuchevskoy group of volcanoes rocks. Exactly this type of rocks is characteristic for CKD as rift structure. The Klyuchevskoy group of volcanoes rock are not typomorphic for this structure and manifest the usual orogenic volcanism stage, typical for much larger area. Miocene plateau effusive rocks differ from rocks of this group only by slightly increased potassium alkalinity. The rift type rocks characteristic feature is not only their increased alkalinity, but also specific microcomponents ratios: Ti/V > 0.004, Nb/Y > 0.28, Dy/Yb > 2.00, La/Yb > 6.5, Sm/Yb > 2.4, Lu/Hf < 0.08. Along with isotopic characteristics, these ratios suggest the existence of the single deep asthenospheric mantle reservoir for initial melts. The Kurile-Kamchatka and Commander-Aleutian island-arc systems’ junction is marked by the increased fluid enrichment (Ce group of REE) of melts for rocks of certain volcanoes: Shiveluch, Kharchinsky, Zarechny.

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