Pleistocene basaltic volcanism in the Krông Nô area and vicinity, Dac Nong Province (Vietnam)

Nguyen Hoang, Ryuichi Shinjo, La The Phuc, Le Duc Anh, Tran Thi Huong, Z. Pécskay, Dao Thai Bac

Research output: Contribution to journalArticle

Abstract

Basaltic and related- pyroclastic products aged 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Krông Nô district, and Ea T'ling and Nam Dong volcanoes in the Cu Jut district covers an area of 120 km2 with a thickness of a few meters to about 80 m. The volcanoes are aligned along a sub-meridian oriented extensional fault, from Phu Son in the south via Chư B'luk, Ea T'ling in the middle to Nam Dong in the north. The basalts are divided into geochemically alkaline and tholeiitic groups. Ne-normative alkaline basalts include samples from the upper layer of Phu Son volcano, those in the Trinh Nu waterfall area (Ea T'ling volcano) and cored samples conducted near the Dray Sap waterfall. Q-normative tholeiitic basalts include all the samples from Chư B'luk and Nam Dong volcanoes, and massive basalts in the lower layer of Phu Son volcano. Geochemically the tholeiitic basalts are vastly different from the alkaline basalts in that they have higher SiO2 (50–55 wt% compared to <47 wt% in alkaline basalt), Al2O3 (>14–16 wt% compared to <14 wt%), lower K2O (<1.5 wt% compared to >1.5–2.5 wt%) and lower TiO2 (<1.8 wt% as compared to >2 wt% in alkaline basalt). Melting temperature and pressure calculations based on computing primitive melt compositions showed that the tholeiitic basalts may be produced in a narrow temperature range of 1365–1385 °C, corresponding to pressure of 1.2–1.6 GPa. The alkaline basalts may be produced in a temperature range between 1400 and 1440 °C and pressure varying from 3.1 to 3.35 GPa. Both the tholeiitic and alkaline basalts are free of crustal contamination. They show geochemically similar characteristics to those of continental intraplate basalts although the alkaline basalt show much more enrichment in incompatible elements. The 87Sr/86Sr and 143Nd/144Nd ratios of the two basaltic groups are quite similar, varying within narrow ranges of, respectively, 0.7038–0.7041, 0.5129–0.51286 but their 206Pb/204Pb isotopic ratios vary widely relative to 207Pb/204Pb and 208Pb/204Pb suggesting their interaction with different isotopic components and/or isotopic evolution history. Isotopic modeling relative to major mantle isotopic components suggests that the alkaline basalts may be generated by interaction between an N-MORB-like and an enriched mantle type 1 (EM1) at deep levels. The isotopic component is usually known as DUPAL-like regional mantle isotopic anomaly believed to be widespread in SE Asian mantle. The isotopic compositions of tholeiitic basalt may be generated by mixing between the DUPAL-like component with an enriched mantle type 2 (EM2)-like at higher levels in the lithospheric mantle.

Original languageEnglish
Article number103903
JournalJournal of Asian Earth Sciences
Volume181
DOIs
Publication statusPublished - Sep 1 2019

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volcanism
basalt
Pleistocene
volcano
tholeiitic basalt
mantle
waterfall
province
temperature
crustal contamination
isotopic ratio
mid-ocean ridge basalt
isotopic composition
volcanic eruption
melting
melt
anomaly
history
modeling

Keywords

  • Dac Nong
  • Isotopic anomaly
  • Krông Nô
  • Pleistocene volcanism
  • Primary melt

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

Pleistocene basaltic volcanism in the Krông Nô area and vicinity, Dac Nong Province (Vietnam). / Hoang, Nguyen; Shinjo, Ryuichi; Phuc, La The; Anh, Le Duc; Huong, Tran Thi; Pécskay, Z.; Bac, Dao Thai.

In: Journal of Asian Earth Sciences, Vol. 181, 103903, 01.09.2019.

Research output: Contribution to journalArticle

Hoang, Nguyen ; Shinjo, Ryuichi ; Phuc, La The ; Anh, Le Duc ; Huong, Tran Thi ; Pécskay, Z. ; Bac, Dao Thai. / Pleistocene basaltic volcanism in the Krông Nô area and vicinity, Dac Nong Province (Vietnam). In: Journal of Asian Earth Sciences. 2019 ; Vol. 181.
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abstract = "Basaltic and related- pyroclastic products aged 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Kr{\^o}ng N{\^o} district, and Ea T'ling and Nam Dong volcanoes in the Cu Jut district covers an area of 120 km2 with a thickness of a few meters to about 80 m. The volcanoes are aligned along a sub-meridian oriented extensional fault, from Phu Son in the south via Chư B'luk, Ea T'ling in the middle to Nam Dong in the north. The basalts are divided into geochemically alkaline and tholeiitic groups. Ne-normative alkaline basalts include samples from the upper layer of Phu Son volcano, those in the Trinh Nu waterfall area (Ea T'ling volcano) and cored samples conducted near the Dray Sap waterfall. Q-normative tholeiitic basalts include all the samples from Chư B'luk and Nam Dong volcanoes, and massive basalts in the lower layer of Phu Son volcano. Geochemically the tholeiitic basalts are vastly different from the alkaline basalts in that they have higher SiO2 (50–55 wt{\%} compared to <47 wt{\%} in alkaline basalt), Al2O3 (>14–16 wt{\%} compared to <14 wt{\%}), lower K2O (<1.5 wt{\%} compared to >1.5–2.5 wt{\%}) and lower TiO2 (<1.8 wt{\%} as compared to >2 wt{\%} in alkaline basalt). Melting temperature and pressure calculations based on computing primitive melt compositions showed that the tholeiitic basalts may be produced in a narrow temperature range of 1365–1385 °C, corresponding to pressure of 1.2–1.6 GPa. The alkaline basalts may be produced in a temperature range between 1400 and 1440 °C and pressure varying from 3.1 to 3.35 GPa. Both the tholeiitic and alkaline basalts are free of crustal contamination. They show geochemically similar characteristics to those of continental intraplate basalts although the alkaline basalt show much more enrichment in incompatible elements. The 87Sr/86Sr and 143Nd/144Nd ratios of the two basaltic groups are quite similar, varying within narrow ranges of, respectively, 0.7038–0.7041, 0.5129–0.51286 but their 206Pb/204Pb isotopic ratios vary widely relative to 207Pb/204Pb and 208Pb/204Pb suggesting their interaction with different isotopic components and/or isotopic evolution history. Isotopic modeling relative to major mantle isotopic components suggests that the alkaline basalts may be generated by interaction between an N-MORB-like and an enriched mantle type 1 (EM1) at deep levels. The isotopic component is usually known as DUPAL-like regional mantle isotopic anomaly believed to be widespread in SE Asian mantle. The isotopic compositions of tholeiitic basalt may be generated by mixing between the DUPAL-like component with an enriched mantle type 2 (EM2)-like at higher levels in the lithospheric mantle.",
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T1 - Pleistocene basaltic volcanism in the Krông Nô area and vicinity, Dac Nong Province (Vietnam)

AU - Hoang, Nguyen

AU - Shinjo, Ryuichi

AU - Phuc, La The

AU - Anh, Le Duc

AU - Huong, Tran Thi

AU - Pécskay, Z.

AU - Bac, Dao Thai

PY - 2019/9/1

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N2 - Basaltic and related- pyroclastic products aged 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Krông Nô district, and Ea T'ling and Nam Dong volcanoes in the Cu Jut district covers an area of 120 km2 with a thickness of a few meters to about 80 m. The volcanoes are aligned along a sub-meridian oriented extensional fault, from Phu Son in the south via Chư B'luk, Ea T'ling in the middle to Nam Dong in the north. The basalts are divided into geochemically alkaline and tholeiitic groups. Ne-normative alkaline basalts include samples from the upper layer of Phu Son volcano, those in the Trinh Nu waterfall area (Ea T'ling volcano) and cored samples conducted near the Dray Sap waterfall. Q-normative tholeiitic basalts include all the samples from Chư B'luk and Nam Dong volcanoes, and massive basalts in the lower layer of Phu Son volcano. Geochemically the tholeiitic basalts are vastly different from the alkaline basalts in that they have higher SiO2 (50–55 wt% compared to <47 wt% in alkaline basalt), Al2O3 (>14–16 wt% compared to <14 wt%), lower K2O (<1.5 wt% compared to >1.5–2.5 wt%) and lower TiO2 (<1.8 wt% as compared to >2 wt% in alkaline basalt). Melting temperature and pressure calculations based on computing primitive melt compositions showed that the tholeiitic basalts may be produced in a narrow temperature range of 1365–1385 °C, corresponding to pressure of 1.2–1.6 GPa. The alkaline basalts may be produced in a temperature range between 1400 and 1440 °C and pressure varying from 3.1 to 3.35 GPa. Both the tholeiitic and alkaline basalts are free of crustal contamination. They show geochemically similar characteristics to those of continental intraplate basalts although the alkaline basalt show much more enrichment in incompatible elements. The 87Sr/86Sr and 143Nd/144Nd ratios of the two basaltic groups are quite similar, varying within narrow ranges of, respectively, 0.7038–0.7041, 0.5129–0.51286 but their 206Pb/204Pb isotopic ratios vary widely relative to 207Pb/204Pb and 208Pb/204Pb suggesting their interaction with different isotopic components and/or isotopic evolution history. Isotopic modeling relative to major mantle isotopic components suggests that the alkaline basalts may be generated by interaction between an N-MORB-like and an enriched mantle type 1 (EM1) at deep levels. The isotopic component is usually known as DUPAL-like regional mantle isotopic anomaly believed to be widespread in SE Asian mantle. The isotopic compositions of tholeiitic basalt may be generated by mixing between the DUPAL-like component with an enriched mantle type 2 (EM2)-like at higher levels in the lithospheric mantle.

AB - Basaltic and related- pyroclastic products aged 0.67, 0.46 and 0.2 Ma produced by eruption of Chư B'luk (Buon Choah), Phu Son (Pass 52, Quang Phu) volcanoes in the Krông Nô district, and Ea T'ling and Nam Dong volcanoes in the Cu Jut district covers an area of 120 km2 with a thickness of a few meters to about 80 m. The volcanoes are aligned along a sub-meridian oriented extensional fault, from Phu Son in the south via Chư B'luk, Ea T'ling in the middle to Nam Dong in the north. The basalts are divided into geochemically alkaline and tholeiitic groups. Ne-normative alkaline basalts include samples from the upper layer of Phu Son volcano, those in the Trinh Nu waterfall area (Ea T'ling volcano) and cored samples conducted near the Dray Sap waterfall. Q-normative tholeiitic basalts include all the samples from Chư B'luk and Nam Dong volcanoes, and massive basalts in the lower layer of Phu Son volcano. Geochemically the tholeiitic basalts are vastly different from the alkaline basalts in that they have higher SiO2 (50–55 wt% compared to <47 wt% in alkaline basalt), Al2O3 (>14–16 wt% compared to <14 wt%), lower K2O (<1.5 wt% compared to >1.5–2.5 wt%) and lower TiO2 (<1.8 wt% as compared to >2 wt% in alkaline basalt). Melting temperature and pressure calculations based on computing primitive melt compositions showed that the tholeiitic basalts may be produced in a narrow temperature range of 1365–1385 °C, corresponding to pressure of 1.2–1.6 GPa. The alkaline basalts may be produced in a temperature range between 1400 and 1440 °C and pressure varying from 3.1 to 3.35 GPa. Both the tholeiitic and alkaline basalts are free of crustal contamination. They show geochemically similar characteristics to those of continental intraplate basalts although the alkaline basalt show much more enrichment in incompatible elements. The 87Sr/86Sr and 143Nd/144Nd ratios of the two basaltic groups are quite similar, varying within narrow ranges of, respectively, 0.7038–0.7041, 0.5129–0.51286 but their 206Pb/204Pb isotopic ratios vary widely relative to 207Pb/204Pb and 208Pb/204Pb suggesting their interaction with different isotopic components and/or isotopic evolution history. Isotopic modeling relative to major mantle isotopic components suggests that the alkaline basalts may be generated by interaction between an N-MORB-like and an enriched mantle type 1 (EM1) at deep levels. The isotopic component is usually known as DUPAL-like regional mantle isotopic anomaly believed to be widespread in SE Asian mantle. The isotopic compositions of tholeiitic basalt may be generated by mixing between the DUPAL-like component with an enriched mantle type 2 (EM2)-like at higher levels in the lithospheric mantle.

KW - Dac Nong

KW - Isotopic anomaly

KW - Krông Nô

KW - Pleistocene volcanism

KW - Primary melt

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