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Article: Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications

TitleGeochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications
Authors
KeywordsAdakite
Collisional Crust Thickening
Da Hinggan Mountains
Geochemistry
Late Jurassic
Issue Date2008
PublisherKexue Chubanshe
Citation
Acta Petrologica Sinica, 2008, v. 24 n. 4, p. 899-910 How to Cite?
Abstract
The Late Jurassic Longgouhe and Ershiyizhan intrusions, located in the Upper Heilongjiang Basin of northern Da Hinggan Mountains, are closely related to the porphyry Cu-Au mineralizations.. The intrusions are mainly composed of quartz diorite, quartz monzodiorite and granodiorite. Most of them are the rocks of high-K calc-alkaline series, with minor of shoshonite series. Their SiO2 and Al2O3 contents range 61.37% - 66.59% and 15.35% - 17.06%, respectively. The MgO content ranges 2.02% - 3.47%, with a high Mg# index ranging from 44 to 59. The (La/Yb)N and δEu values range from 16.85 to 81.73 and from 0.68 to 0.93, respectively, showing strongly fractionated REE patterns that are similar to those of adakites. The rocks are enriched in Ba, Sr and LREE, but strongly depleted in Nb and Ta, and slightly depleted in Rb and Ti. The Yb and Y contents span of 0.31 - 1.32 μg/g and 4.32 - 12.07 μg/g, respectively, suggesting that the rocks are depleted in Yb and Y. The Sr /Y ratios are between 67.74 and 220.60, showing a clear feature of low-Y and high-Sr. All these geochemical characteristics are similar to adakites. Considering that the Paleo-Asian Ocean and Mongol-Okhotsk Ocean were closed in the Late Paleozoic and Permian-Middle Jurassic, respectively, the origin of the interested adakites can be related to partial melting of delaminated crust which were thickened by the collisional orogeny between the Siberia and Mongol-Sinokorea continents.
Persistent Identifierhttp://hdl.handle.net/10722/92047
ISSN
2013 Impact Factor: 1.224
2013 SCImago Journal Rankings: 0.806
References

 

DC FieldValueLanguage
dc.contributor.authorWu, Gen_HK
dc.contributor.authorChen, YJen_HK
dc.contributor.authorSun, FYen_HK
dc.contributor.authorLi, JCen_HK
dc.contributor.authorLi, ZTen_HK
dc.contributor.authorWang, XJen_HK
dc.date.accessioned2010-09-17T10:34:31Z-
dc.date.available2010-09-17T10:34:31Z-
dc.date.issued2008en_HK
dc.identifier.citationActa Petrologica Sinica, 2008, v. 24 n. 4, p. 899-910en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92047-
dc.description.abstractThe Late Jurassic Longgouhe and Ershiyizhan intrusions, located in the Upper Heilongjiang Basin of northern Da Hinggan Mountains, are closely related to the porphyry Cu-Au mineralizations.. The intrusions are mainly composed of quartz diorite, quartz monzodiorite and granodiorite. Most of them are the rocks of high-K calc-alkaline series, with minor of shoshonite series. Their SiO2 and Al2O3 contents range 61.37% - 66.59% and 15.35% - 17.06%, respectively. The MgO content ranges 2.02% - 3.47%, with a high Mg# index ranging from 44 to 59. The (La/Yb)N and δEu values range from 16.85 to 81.73 and from 0.68 to 0.93, respectively, showing strongly fractionated REE patterns that are similar to those of adakites. The rocks are enriched in Ba, Sr and LREE, but strongly depleted in Nb and Ta, and slightly depleted in Rb and Ti. The Yb and Y contents span of 0.31 - 1.32 μg/g and 4.32 - 12.07 μg/g, respectively, suggesting that the rocks are depleted in Yb and Y. The Sr /Y ratios are between 67.74 and 220.60, showing a clear feature of low-Y and high-Sr. All these geochemical characteristics are similar to adakites. Considering that the Paleo-Asian Ocean and Mongol-Okhotsk Ocean were closed in the Late Paleozoic and Permian-Middle Jurassic, respectively, the origin of the interested adakites can be related to partial melting of delaminated crust which were thickened by the collisional orogeny between the Siberia and Mongol-Sinokorea continents.en_HK
dc.languageengen_HK
dc.publisherKexue Chubansheen_HK
dc.relation.ispartofActa Petrologica Sinicaen_HK
dc.subjectAdakiteen_HK
dc.subjectCollisional Crust Thickeningen_HK
dc.subjectDa Hinggan Mountainsen_HK
dc.subjectGeochemistryen_HK
dc.subjectLate Jurassicen_HK
dc.titleGeochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implicationsen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-49149089695en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-49149089695&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue4en_HK
dc.identifier.spage899en_HK
dc.identifier.epage910en_HK

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