Sw Borno
Sw Borno
Cretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages and Sr-Nd-Pb-Hf-O isotopic and whole-rock geochemical data for the Cretaceous granitoids in the Schwaner Mountains. These granitoid samples yield formation ages of 92-80 Ma and can be geochemically subdivided into Group 1 ...
Mesozoic Paleo-Pacific Subduction Beneath SW Borneo: U-Pb Geochronology of the Schwaner Granitoids and the Pinoh Metamorphic Group
11 июл. 2025 г.
SW Borneo is the southeastern promontory of Sundaland the continental core of SE Asia, previously assumed to be the oldest part of Borneo. The rocks in SW Borneo are the Pinoh Metamorphic Group (PMG) and granitoids of the Schwaner batholith .
The Paleo-Pacific subduction margin followed the eastern side of Sundaland and South China, and (B) accretion of SW Borneo to Sundaland before c. 135 Ma and continuation of subduction-related ...
SW Borneo underwent further autochthonous accretion along its SE margin (ca. 186 Ma and ca. 140 Ma) in a Jurassic Meso-Tethys and Paleo-Pacific supra-subduction zone setting. Our revision locates SW Borneo with other SE Tethysides blocks in Eurasia where accretionary orogens have influenced rises after 200 Ma.
The current tectonic model for Borneo in SE Asia suggests that the SW Borneo block rifted from NW Australia at ca. 190 Ma and drifted across the Tethyan Ocean to collide with Eurasia in the Early Cretaceous. But, the global zircon Hf trend after 200 Ma indicates that circum-Pacific-style accretionary orogens prevail. The SW Borneo detrital zircon data set, which combines our new data with ...
The Schwaner Mountains are the topographic expression of basement rocks in SW Borneo. The basement is composed of a suite of metamorphic rocks, the Pinoh Metamorphic Group (PMG), which are ...
PDF | Cretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents... | Find, read and cite all the research ...
The current tectonic model for Borneo in SE Asia suggests that the SW Borneo block rifted from NW Australia at ca. 190 Ma and drifted across the Tethyan Ocean to collide with Eurasia in the Early Cretaceous. But, the global zircon Hf trend after 200 Ma indicates that circum-Pacific-style accretionary orogens prevail.
Though debatable, we infer the SW Borneo block to be a Sundaland continuation; Semitau shows an affinity for South Cathaysia. Both of the terranes would accrete onto Sundaland during the Indosinian orogeny.
The ceremony was presided over by the State Coordinator of the Renewed Hope Ambassadors who is also the Special Adviser on Monitoring and Evaluation to the Borno State Governor Hon. Engr. Baba Bukar Gujbawu, FNSE, in Maiduguri. The initiative is aimed at deepening grassroots mobilisation and strengthening support for the Renewed Hope Agenda.
6 дн. назад
Frigid today with a high of 12°F and a low of -4°F.
(2022) Qian et al. Lithosphere. Cretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages an...
Tectonic model suggests that early crust of SW Borneo has undergone delamination and sinking through spontaneous instability due to rupture and resulting downwarping.
1 мая 2024 г.
Metamorphic and magmatic rocks are present in the northwestern part of the Schwaner Mountains of West Kalimantan. This area was previously assigned to SW Borneo (SWB) and interpreted as an Australian-origin block.
East of the SW Borneo block are the Meratus Mountains, which mark a Cretaceous suture between SW Borneo and the East Java-West Sulawesi block which is thought to be a Gondwana fragment (Smyth et ...
The fi Paleo-Paci c subduction margin followed the eastern side of Sundaland and South China, and (B) accretion of SW Borneo to Sundaland before c. 135 Ma and fi continuation of subduction-related magmatism associated with the Paleo-Paci fic in West Borneo and initiation of magmatism in SW Borneo that formed the Menunuk Volcanics, Sepauk ...
Request PDF | Southwest Borneo, an autochthonous Pangea-Eurasia assembly proxy: Insights from detrital zircon record | The current tectonic model for Borneo in SE Asia suggests that SW Borneo ...
Download scientific diagram | Plate-tectonic classification of the collision margin of SW Borneo and North Borneo showing suture zone, continental arc, trench, accretionary prism, fore-arc basin ...
Cretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacific subduction and regional correlation. This paper presents new zircon ages and Sr-Nd-Pb-Hf-O isotopic and whole-rock geochemical data for the Cretaceous granitoids in the Schwaner Mountains.
1 авг. 2025 г.
New geochronological data from SW Borneo indicate that supposed basement rocks of the Pinoh Metamorphic Group are Cretaceous rather than Palaeozoic as accepted until now.
Cretaceous igneous rocks in SW Borneo are significant for investigating the Paleo-Pacic subduction and regional correlation. fi This paper presents new zircon ages and Sr-Nd-Pb-Hf-O ...
The Ruwai skarn Fe-Zn-Pb-Ag deposit， situated in the Lamandau region of the South Schwaner zone within the Southwest Borneo block （SW Borneo）， is the largest base metal deposit in Indonesia. The exposed Sukadana granodiorite within the deposit is genetically linked to mineralization. Zircon U-Pb dating of the granodiorite yields an age of 95.0 ± 0.7 Ma， while garnet U-Pb dating of ...
Triassic and Jurassic meta-igneous rocks discovered in the NW Schwaner Mountains are very different from the almost entirely Cretaceous rocks in the northern Schwaner Mountains assigned to the SW Borneo block.
The rise of and growth of resulted from successive accretion of Gondwana-derived continental fragments at the expense of Tethyan oceans, yet how and where the eastern Paleo-Tethys closed in SE Asia remain controversial. Here we report new and synthesized detrital data from Borneo and relevant regions revealing that West and SW Borneo show consistent age profiles resembling that of Northern ...
PDF | New geochronological data from SW Borneo indicate that supposed basement rocks of the Pinoh Metamorphic Group are Cretaceous rather than... | Find, read and cite all the research you need on ...
Except for SW Sarawak, which is a continental area with Late Paleozoic and Mesozoic sediments of Indochina affinity, the geology of onshore North Borneo is dominated by a series of W-E to SW-NE trending accretionary complexes and large younger delta systems that are home to many oil and gas fields.
This study focused on the features and evolution of igneous suites and magmatic arcs in the Southwest (SW) Borneo using multiple techniques, including field investigation, petrology analysis, geochemistry, and U-Pb zircon dating. Batholiths in the SW Borneo comprises of granite, granodiorite, diorite, tonalite, gabbro, and rhyolite; arc magmatism spanned the late Mesozoic but dominated in the ...
SW Borneo Batuan metamorf di barat daya Kalimantan sebelumnya dianggap pra-Kapur, namun penelitian baru menunjukkan bahwa mereka mengandung zirkon Cretaceous dan berasal dari material vulkanik yang dimakamkan dan bermetamorfosis selama ekstensi pada awal Kapur.
The SW Borneo is commonly considered as a microcontinent that was rifted from Gondwana and accreted to Eurasia continent [17, 31, 37 - 39]. Recent studies on Permo-Triassic granitoids from the SW Borneo suggested that the SW Borneo was in an active continental margin due to the eastward subduction of the Paleo-Tethyan Ocean [19].
SW Borneo is interpreted as a Gondwana-derived continental fragment that rifted from Australia in the Mesozoic, recorded magmatism and metamorphism related to southward subduction along its northern margin in the Cretaceous, and accreted to Sundaland in the Cretaceous (Davies et al., 2014; Hall, 2012; Hall, Clements, & Smyth, 2009).
The provenance characteristics of the northern Borneo sandstones are discussed here based on analysis of detrital modes, heavy minerals, as well as determination of detrital zircon U-Pb ages. Neogene formations including the Meligan and Setap Shale Formations of SW Sabah and the Kudat Formation (Fig. 2) of northern Sabah were also studied.
PDF | On May 26, 2015, Lorin Davies published Age and Character of Basement Rocks in SW Borneo: New Insights from Ar-Ar Dating of Pinoh Metamorphic Group Rocks. | Find, read and cite all the ...
Discover Borno, Italy's best kept secret in the Northern mountains. What to do in Borno, where to stay and how to get to this charming town.
The Southwest Borneo (SW Borneo) block belongs to Sundaland and is the oldest continental fragment of Borneo that is believed to derive from the Gondwana land. The U-Pb isotopic dating ages of 113 detrital zircons from sandstones of the Ketapang Complex in SW Borneo range from 3 298 Ma to 78 Ma, and show six major age populations: 2 476-2 344 Ma, 2 016-1 831 Ma, 1 296-759 Ma, 455-406 ...
The SW Borneo (Banda) Block collided with eastern Sundaland at c. 135 Ma. Following this, large I-type granitoid plutons and arc volcanics formed in the NWSZ and NSZ between c. 90 and 132 Ma, associated with Cretaceous Paleo-Pacific subduction. The largest intrusion is the c. 110 to 120 Ma Sepauk Tonalite.
The heterogeneous Sundaland region was assembled by closure of Tethyan oceans and addition of continental fragments. Its Mesozoic and Cenozoic history…
SW Borneo rifted from Gondwana in the Jurassic, collided with SE Sundaland in the early Cretaceous before then experiencing subduction of the paleo-Pacific plate.
The SW Borneo (Banda) Block collided with eastern Sundaland at c. 135 Ma. Following this, large I-type granitoid plutons and arc volcanics formed in the NWSZ and NSZ between c. 90 and 132 Ma, associated with Cretaceous Paleo-Pacific subduction. The largest intrusion is the c. 110 to 120 Ma Sepauk Tonalite.
Figure 5 - A) Total alkalis vs SiO2 diagram showing compositions of meta-pelites and other rock types. B) Trace element protolith discriminator for Pinoh Metamorphic Group (PMG) meta-pelites. C) Incompatible trace element spider diagram showing compositions of PMG rocks compared with igneous rocks from the NSZ. - "Cretaceous Crust in SW Borneo : Petrological, Geochemical and Geochronological ...
The tectonic affinity of West Borneo and its relationship with the East Asia continental margin are key issues for unraveling SE Asia tectonics. New z…
The Argo block docked with SW Borneo along the strike-slip Meratus suture, forming East Java and West Sulawesi, and the Woyla Arc docked with the Sumatra margin of Sundaland.
31 дек. 2025 г.
Smaller microcontinental blocks now distributed on the SW margin of Sundaland, around the South China Sea, and in eastern Indonesia originally formed part of larger terranes in the Permian, and reached their current locations following Mesozoic and Cenozoic disruption due to rifting, collision and strike-slip displacement.
The Schwaner Complex in Southwest (SW) Borneo, the largest batholith in Borneo, has preserved abundant Mesozoic magmatic and sedimentary records, and is a key area for investigating the Mesozoic subduction of Paleo-Pacific and tectonic nature of SW Borneo.
In this study, we present new zircon U-Pb-Hf isotope and whole-rock geochemical data of the multiphase volcanic and plutonic rocks at Ruwai, U-Pb analyses of garnet and titanite, and Re-Os analyses of sulfides and magnetite. These data constrain the mineralization age and identify the causative intrusion (s) associated with skarn mineralization at Ruwai. In addition, we present elemental and ...
The Schwaner Mountains are the topographic expression of basement rocks in SW Borneo. The basement is composed of a suite of metamorphic rocks, the Pinoh Metamorphic Group (PMG), which are intruded by Cretaceous granitoids.
We present a new extensional tectonic model for the Cenozoic history of SE Asia and the opening of the South China Sea (SCS), proposing a feedback mec…
Wacheza ngoma, Borno Faili:Nigeria-Borno ramani.PNG Ramani ya Borno Borno ni jimbo la Nigeria katika kaskazini ya nchi lenye wakazi milioni nne na nusu. Mji mkuu pia mji mkubwa wa jimbo ni Maiduguri (wakazi 1,112,511). Imepakana na nchi jirani za Niger, Chadi na Kamerun, halafu majimbo ya Nigeria ya Adamawa, Yobe na Gombe. Borno ni hasa eneo la Wakanuri. Jimbo la leo ni mabaki ya milki ya ...
1 мар. 2024 г.
11 дек. 2025 г.
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