Geochemistry and tectonic setting of the Central Loei volcanic rocks, Pak Chom area, Loei, northeastern Thailand

Panjasawatwong, Yuenyong; Zaw, Khin; Chantaramee, S.; Limtrakun, Phisit; Pirarai, Kriangsak

doi:10.1016/j.jseaes.2004.09.008

Cited by 58 publications

(57 citation statements)

References 30 publications

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“…The regional magnetic anomaly amplitude of this zone is distinctively higher than those of the other sub-domains in the central domain. This high anomaly corresponds to MORB and oceanic islandarc lavas reported by Panjasawatworng et al 6 . This zone is, therefore, interpreted to have formed in a volcanic island arc in the Devonian to Carboniferous 17 .…”

Section: Magnetic Responses Related To Rock Units Magnetic Responses supporting

confidence: 81%

“…In addition, the detailed studies of igneous rocks in the area 4,5,6,8 were also evaluated for visualizing and classifying magnetic domains.…”

Section: Data Sets Data Sets Data Sets Data Sets Data Setsmentioning

confidence: 99%

“…These volcanic rocks have been assigned to those erupted in a mid-ocean ridge to back arc basin environment, and have a wholerock Rb-Sr Isochron age of 341 ±11 Ma 4 . Geochemical results from the volcanic rocks in the Loei area by Panjasawatworng et al 6 , suggest that the Loei volcanic rocks are comprised of MORB and oceanic island-arc lava.…”

Section: Magnetic Responses Related To Rock Units Magnetic Responses mentioning

confidence: 99%

“…The Loei area has been surveyed and studied extensively by several geoscientists for many decades in the contexts of geological mapping, geochemistry, structural geology 6 studied geochemistry and tectonic setting of basaltic rocks of the Loei-PhetchabunKo Chang volcanic belt in Pak Chom area. Recently, Neawsuparp and Charusiri 7 studied the lineaments determined from the enhanced Landsat TM5 in the Loei and nearby areas.…”

Section: Introductionmentioning

confidence: 99%

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Neawsuparp¹,

Charusiri²,

Meyers³

2005

ScienceAsia

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ABSTRACT:The northern part of the roughly north-south trending Loei suture zone has been investigated extensively by several geoscientists for more than five decades not only for its complex geology but also for mineral exploration. In this study, we have reprocessed existing detailed aeromagnetic data for interpreting the continuity of geological units and structures where most of the pre-Cenozoic rock units are overlain by regolith cover comprised of recent soils, alluvial deposits, and colluvium surrounding hills and mountains. The aeromagnetic data were run through a series of filter routines to highlight deep and shallow magnetic features. These include analytic signal, reduction to the pole, first vertical derivative, directional cosine filtering, and upward continuation. Interpretation of all the processed geophysical data has been carried out by integration of aeromagnetic data with electromagnetic data, radiometric data, enhanced Landsat images and GIS geological information. Three geological domains (eastern, central, and western) were interpreted from the geophysical data to correspond to assemblages of contrasting rock types, as well as different regional structures identified in this study. These three domains are interpreted to be markedly separated by thrusts and sub-vertical shear zones. The magnetic data were also used to model the geometry of mafic units and granitic intrusions in 3 dimensions. Magnetic mafic bodies in the Loei suture zone were found to display their dip direction to the east. Magnetic units running along the eastern side of the Loei suture zone correspond fairly well to folded and thrust faulted basalt flows of Devonian age. Moreover, some PermoTriassic granitoid intrusions have a strong magnetic fabric, and a few have surrounding magnetic rings are likely caused by magnetic minerals in hornfels. The others turn out to be a single smaller magnetic rings at depths suggesting only one feeding magma chamber. A few Permo-Triassic felsic to intermediate lava flows are identified by their hummocky magnetic texture. Northeast-southwest trending faults observed in the magnetic data cross-cut Triassic granite intrusions and pre-Jurassic stratigraphy, mostly producing more than 1 km of sinistral offsets. Our new interpretation agrees with the existing geological bedrock mapping in a broad sense, but shows differences in the continuity of features and extent of granitoid intrusions, and contains more large-scale structural detail. Our interpretation overlain onto the mineral occurrences map with GIS application will help to improve subsurface exploration and will help mineral explorers by highlighting new mineral target areas under thin Quaternary regolith cover. List of abbr List of abbr List of abbr List of abbr List of abbreviations: eviations: eviations:

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Section: Magnetic Responses Related To Rock Units Magnetic Responses supporting

confidence: 81%

“…In addition, the detailed studies of igneous rocks in the area 4,5,6,8 were also evaluated for visualizing and classifying magnetic domains.…”

Section: Data Sets Data Sets Data Sets Data Sets Data Setsmentioning

confidence: 99%

Section: Magnetic Responses Related To Rock Units Magnetic Responses mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Untitled

Neawsuparp¹,

Charusiri²,

Meyers³

2005

ScienceAsia

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“…In recent years, many studies have been carried out to decipher the evolution of the main Paleo-Tethys Ocean, especially the correlation between magmatism and the change from a subduction to a post-collisional regime in Southeast Asia (e.g., Barber and Crow, 2009;Barr et al, 2000Barr et al, , 2006Metcalfe, 2000Metcalfe, , 2002Metcalfe, , 2003Metcalfe, , 2006Metcalfe, , 2011Panjasawatwong et al, 2003Panjasawatwong et al, , 2006Sone and Metcalfe, 2008;Srichan et al, 2009). Nevertheless, in the case of the Lancangjiang zone in SW China, the extensive exposure of the elongate Lincang batholith with an area of over 7400 km 2 and measuring 350 km long by 10-48 km wide, and its association with large volumes of Triassic volcanoclastic rocks, have been paid little attention.…”

Section: Introductionmentioning

confidence: 99%

Mid-Triassic felsic igneous rocks from the southern Lancangjiang Zone, SW China: Petrogenesis and implications for the evolution of Paleo-Tethys

Peng

Wilde

Wang

et al. 2013

Lithos

125

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Petrogenesis of the early Jurassic Ora batholith in south‐western Cambodia

et al. 2022

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The Ora batholith in south‐western Cambodia is situated in the western part of Indochina and east of the Inthanon–Bentong–Raub Palaeo‐Tethys suture and thus bears significant constraints for the equivocal crustal generation of the Palaeo‐Tethys orogenic belt in Mainland South‐east Asia. The Ora batholith consists of monzonitic granite (Group 1), alkali‐feldspar granite (Group 2), and biotite granite (Group 3), and they yield similar Early Jurassic ages of 186.0–199.7 Ma. Group 2 are high‐silica (SiO2 > 75 wt%) rocks with lower TiO2, Al2O3, FeOtot, MgO, CaO, P2O5, Eu, Ba, Sr, P, and Ti contents compared to those of the other two groups. Group 2 and 3 are classified as fractionated‐type granitoids, whereas Group 1 is unfractionated granite as the complementary residual of the fractionated rocks. All groups have positive εHf(t) values from +2.29 to +8.83, suggesting they were cogenetic and derived from partial melting of the lower crust with the addition of asthenospheric mantle material. Integrating with other granitoids in this region, we suggest the Ora granitoids belong to I‐type granitoids. Our petrogenetic and zircon U–Pb age data suggest the Ora granitoids were related to the Early Jurassic post‐collisional magmatism that resulted from crustal thickening and mantle lithospheric delamination due to a denser crustal root than the underlying mantle lithosphere after the Palaeo‐Tethys Ocean closure and collision between the Sibumasu and Indochina terranes. Then the following upwelling of the asthenospheric mantle not only heated and caused partial melting of the lower crust and mantle wedge, but also supplied asthenospheric material to generate the high‐εHf(t) magma.

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Geochemistry and tectonic setting of the Central Loei volcanic rocks, Pak Chom area, Loei, northeastern Thailand

Cited by 58 publications

References 30 publications

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Mid-Triassic felsic igneous rocks from the southern Lancangjiang Zone, SW China: Petrogenesis and implications for the evolution of Paleo-Tethys

Petrogenesis of the early Jurassic Ora batholith in south‐western Cambodia

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