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

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TitleGeochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications
AuthorsWu, G3
Chen, YJ3 4
Sun, FY1
Li, JC2
Li, ZT2
Wang, XJ2
KeywordsAdakite
Collisional Crust Thickening
Da Hinggan Mountains
Geochemistry
Late Jurassic
Issue Date2008
PublisherKexue Chubanshe
CitationActa Petrologica Sinica, 2008, v. 24 n. 4, p. 899-910 [How to Cite?]
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.
ISSN1000-0569
2011 SCImago Journal Rankings: 0.036
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorWu, G
dc.contributor.authorChen, YJ
dc.contributor.authorSun, FY
dc.contributor.authorLi, JC
dc.contributor.authorLi, ZT
dc.contributor.authorWang, XJ
dc.date.accessioned2010-09-17T10:34:31Z
dc.date.available2010-09-17T10:34:31Z
dc.date.issued2008
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.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationActa Petrologica Sinica, 2008, v. 24 n. 4, p. 899-910 [How to Cite?]
dc.identifier.epage910
dc.identifier.issn1000-0569
2011 SCImago Journal Rankings: 0.036
dc.identifier.issue4
dc.identifier.scopuseid_2-s2.0-49149089695
dc.identifier.spage899
dc.identifier.urihttp://hdl.handle.net/10722/92047
dc.identifier.volume24
dc.languageeng
dc.publisherKexue Chubanshe
dc.relation.ispartofActa Petrologica Sinica
dc.relation.referencesReferences in Scopus
dc.subjectAdakite
dc.subjectCollisional Crust Thickening
dc.subjectDa Hinggan Mountains
dc.subjectGeochemistry
dc.subjectLate Jurassic
dc.titleGeochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications
dc.typeArticle
Author Affiliations
  1. Jilin University
  2. Shenyang Center China Geological Survey
  3. Guangzhou Institute of Geochemistry Chinese Academy of Sciences
  4. Peking University