Petrology, geochemistry and tectonic evolution of the South Sulawesi basement rocks, Indonesia

Abstract. Conflicting interpretations of the > 500 km long, east-west trending Qiangtang Metamorphic Belt have led to very different and contradicting models for the Permo-Triassic tectonic evolution of Central Tibet. We define two metamorphic events, one that only affected Pre-Ordovician basement rocks and one subduction-related Triassic high-pressure metamorphism event. Detailed mapping and structural analysis allowed us to define three main units that were juxtaposed due to collision of the North and South Qiangtang terranes after closure of the Ordovician-Triassic ocean that separated them. The base is formed by the Precambrian-Carboniferous basement, followed by non-metamorphic ophiolitic mélange, containing mafic rocks that range in age from the Ordovician to Middle Triassic. The top of the sequence is formed by strongly deformed sedimentary mélange that contains up to > 10 km size rafts of both un-metamorphosed Permian sediments and high-pressure blueschists. We propose that the high-pressure rocks were exhumed from underneath the South Qiangtang Terrane in an extensional setting caused by the pull of the northward subducting slab of the Shuanghu-Tethys. High-pressure rocks, sedimentary mélange and margin sediments were thrust on top of the ophiolitic mélange that was scraped off the subducting plate. Both units were subsequently thrust on top of the South Qiantang Terrane continental basement. Onset of Late Triassic sedimentation marked the end of the amalgamation of both Qiangtang terranes and the beginning of spreading between Qiantang and North Lhasa to the south, leading to the deposition of thick flysch deposits in the Jurassic.

Download Full-text

Tectonic evolution and high-pressure rock exhumation in the Qiangtang terrane, central Tibet

Solid Earth ◽

10.5194/se-6-457-2015 ◽

2015 ◽

Vol 6 (2) ◽

pp. 457-473 ◽

Cited By ~ 14

Author(s):

Z. Zhao ◽

P. D. Bons ◽

G. Wang ◽

A. Soesoo ◽

Y. Liu

Keyword(s):

High Pressure ◽

Tectonic Evolution ◽

Late Triassic ◽

The South ◽

Metamorphic Belt ◽

The North ◽

Ophiolitic Mélange ◽

Basement Rocks ◽

Central Tibet ◽

Qiangtang Terrane

Abstract. Conflicting interpretations of the > 500 km long, east–west-trending Qiangtang metamorphic belt have led to very different and contradicting models for the Permo–Triassic tectonic evolution of central Tibet. We define two metamorphic events, one that only affected pre-Ordovician basement rocks and one subduction-related Triassic high-pressure metamorphism event. Detailed mapping and structural analysis allowed us to define three main units that were juxtaposed due to collision of the north and south Qiangtang terranes after closure of the Ordovician–Triassic ocean that separated them. The base is formed by the Precambrian–Carboniferous basement, followed by non-metamorphic ophiolitic mélange containing mafic rocks that range in age from the Ordovician to Middle Triassic. The top of the sequence is formed by strongly deformed sedimentary mélange that contains up to > 10 km size rafts of both unmetamorphosed Permian sediments and high-pressure blueschists. We propose that the high-pressure rocks were exhumed from underneath the south Qiangtang terrane in an extensional setting caused by the pull of the northward subducting slab of the Shuanghu–Tethys. High-pressure rocks, sedimentary mélange and margin sediments were thrust on top of the ophiolitic mélange that was scraped off the subducting plate. Both units were subsequently thrust on top of the south Qiantang terrane continental basement. Onset of Late Triassic sedimentation marked the end of the amalgamation of both Qiangtang terranes and the beginning of spreading between Qiantang and north Lhasa to the south, leading to the deposition of thick flysch deposits in the Jurassic.

Download Full-text

3D density modelling of Gemeric granites of the Western Carpathians

Geologica Carpathica ◽

10.1515/geoca-2017-0014 ◽

2017 ◽

Vol 68 (3) ◽

pp. 177-192 ◽

Cited By ~ 2

Author(s):

Ján Šefara ◽

Miroslav Bielik ◽

Jozef Vozár ◽

Martin Katona ◽

Viktória Szalaiová ◽

...

Keyword(s):

Tectonic Evolution ◽

Lower Boundary ◽

Western Carpathians ◽

Mountain Range ◽

The South ◽

Geophysical Research ◽

The North ◽

Basement Rocks ◽

Tectonic Contact ◽

Upper Boundary

Abstract The position of the Gemeric Superunit within the Western Carpathians is unique due to the occurrence of the Lower Palaeozoic basement rocks together with the autochthonous Upper Palaeozoic cover. The Gemeric granites play one of the most important roles in the framework of the tectonic evolution of this mountain range. They can be observed in several small intrusions outcropping in the western and south-eastern parts of the Gemeric Superunit. Moreover, these granites are particularly interesting in terms of their mineralogy, petrology and ages. The comprehensive geological and geophysical research of the Gemeric granites can help us to better understand structures and tectonic evolution of the Western Carpathians. Therefore, a new and original 3D density model of the Gemeric granites was created by using the interactive geophysical program IGMAS. The results show clearly that the Gemeric granites represent the most significant upper crustal anomalous low-density body in the structure of the Gemeric Superunit. Their average thickness varies in the range of 5–8 km. The upper boundary of the Gemeric granites is much more rugged in comparison with the lower boundary. There are areas, where the granite body outcrops and/or is very close to the surface and places in which its upper boundary is deeper (on average 1 km in the north and 4–5 km in the south). While the depth of the lower boundary varies from 5–7 km in the north to 9–10 km in the south. The northern boundary of the Gemeric granites along the tectonic contact with the Rakovec and Klátov Groups (North Gemeric Units) was interpreted as very steep (almost vertical). The results of the 3D modelling show that the whole structure of the Gemeric Unit, not only the Gemeric granite itself, has an Alpine north-vergent nappe structure. Also, the model suggests that the Silicicum–Turnaicum and Meliaticum nappe units have been overthrusted onto the Golčatov Group.

Download Full-text

IMPLEMENTATION OF SUSTAINABLE AQUACULTURE AS A MODEL OF SATO UMI TO IMPROVE PRODUCTIVITY WITHIN COASTAL AREA OF INDONESIA

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.21610/conferencearticle_58b4316061289 ◽

2017 ◽

Author(s):

Suhendar I Sachoemar ◽

Tetsuo Yanagi ◽

Mitsutaku Makino ◽

...

Keyword(s):

Coastal Area ◽

Sustainable Aquaculture ◽

The South ◽

West Java ◽

The Public ◽

Central Java ◽

South Sulawesi ◽

Similar Program ◽

Technology Dissemination

The development of sustainable model of aquaculture by applying Sato Umi concept within coastal area of Indonesia has expanded from the center of first experiment in the northern coastal area of west Java to central Java (western Indonesia) and Bantaeng in the South Sulawesi of central Indonesia. The similar program has also been proposed for Maluku Province in the eastern part of Indonesia. In the next 5 years, Indonesia is developing the Techno Parks Program in some areas, in which aquaculture and fisheries activities development on the base of Sato Umi concept in the coastal area are involves in this program. The development of Techno Parks are directed as a center application of technology to stimulate the economy in the regency, and a place of training, apprenticeship, technology dissemination center, and center business advocacy for the public. Hopely, Sato Umi concept that has a similar spirit with Techno Park can be applied to support the implementation of Techno Park program in Indonesia

Download Full-text

Structure and tectonic evolution of the South Patagonian fold and thrust belt: Coupling between subduction dynamics, climate and tectonic deformation

Andean Tectonics ◽

10.1016/b978-0-12-816009-1.00024-1 ◽

2019 ◽

pp. 675-697

Author(s):

Matías C. Ghiglione ◽

Gonzalo Ronda ◽

Rodrigo J. Suárez ◽

Inés Aramendía ◽

Vanesa Barberón ◽

...

Keyword(s):

Tectonic Evolution ◽

Tectonic Deformation ◽

Thrust Belt ◽

The South ◽

Fold And Thrust Belt

Download Full-text

Tectonic Evolution of the SE West Siberian Basin (Russia): Evidence from Apatite Fission Track Thermochronology of Its Exposed Crystalline Basement

Minerals ◽

10.3390/min11060604 ◽

2021 ◽

Vol 11 (6) ◽

pp. 604

Author(s):

Evgeny V. Vetrov ◽

Johan De Grave ◽

Natalia I. Vetrova ◽

Fedor I. Zhimulev ◽

Simon Nachtergaele ◽

...

Keyword(s):

Tectonic Evolution ◽

Fission Track ◽

Analytical Data ◽

Tectonic Activity ◽

Apatite Fission Track ◽

Tectonic Processes ◽

Basement Rocks ◽

Fission Track Thermochronology ◽

History Of ◽

West Siberian Basin

The West Siberian Basin (WSB) is one of the largest intracratonic Meso-Cenozoic basins in the world. Its evolution has been studied over the recent decades; however, some fundamental questions regarding the tectonic evolution of the WSB remain unresolved or unconfirmed by analytical data. A complete understanding of the evolution of the WSB during the Mesozoic and Cenozoic eras requires insights into the cooling history of the basement rocks as determined by low-temperature thermochronometry. We presented an apatite fission track (AFT) thermochronology study on the exposed parts of the WSB basement in order to distinguish tectonic activation episodes in an absolute timeframe. AFT dating of thirteen basement samples mainly yielded Cretaceous cooling ages and mean track lengths varied between 12.8 and 14.5 μm. Thermal history modeling based on the AFT data demonstrates several Mesozoic and Cenozoic intracontinental tectonic reactivation episodes affected the WSB basement. We interpreted the episodes of tectonic activity accompanied by the WSB basement exhumation as a far-field effect from tectonic processes acting on the southern and eastern boundaries of Eurasia during the Mesozoic–Cenozoic eras.

Download Full-text

FAKTOR PENGELOLAAN YANG MEMPENGARUHI TINGKAT PRODUKSI RUMPUT LAUT Kappaphycus alvarezii DI PERAIRAN PANTAI SELATAN PROVINSI SULAWESI SELATAN

Jurnal Riset Akuakultur ◽

10.15578/jra.5.3.2010.491-504 ◽

2016 ◽

Vol 5 (3) ◽

pp. 491

Author(s):

Erna Ratnawati ◽

Akhmad Mustafa ◽

Rohama Daud

Keyword(s):

Coastal Waters ◽

Management Practices ◽

Kappaphycus Alvarezii ◽

The South ◽

Dummy Variable ◽

South Sulawesi ◽

Yield Production ◽

Long Line ◽

Seed Origin ◽

Seaweed Production

Perairan pantai Kabupaten Jeneponto, Bantaeng, dan Bulukumba merupakan sentra produksi rumput laut Kappaphycus alvarezii di Sulawesi Selatan. Pengelolaan budidaya yang dilakukan oleh pembudidaya di daerah tersebut cukup bervariasi sehingga dilakukan penelitian yang bertujuan untuk mengetahui faktor pengelolaan budidaya yang mempengaruhi produksi rumput laut. Metode survai melalui pengajuan kuesioner kepada 62 responden secara terstruktur. Sebagai peubah tidak bebas dalam penelitian ini adalah produksi rumput laut, sedangkan peubah bebas adalah faktor pengelolaan budidaya. Analisis regresi berganda dengan peubah boneka digunakan untuk memprediksi produksi rumput laut. Hasil penelitian menunjukkan bahwa produksi rumput laut di perairan selatan Sulawesi Selatan berkisar antara 463-5.000 dengan rata-rata 1.502,3 kg kering/3.000 m2 yang dibudidayakan dengan tali panjang. Faktor pengelolaan budidaya yang mempengaruhi produksi rumput laut adalah jarak antar tali ris, jarak antar rumpun dalam tali ris, hama baronang, penyakit ice-ice, bobot bibit, asal bibit dan sumber cemaran. Untuk meningkatkan produksi rumput laut di perairan selatan Sulawesi Selatan dapat dilakukan melalui peningkatan bobot bibit antara 36,9 sampai 100,0 g/rumpun, menggunakan bibit yang tidak diangkut terlalu lama, tidak menambah jarak antar tali ris sampai melebihi 1,0 m, tidak menambah jarak antar rumpun dalam tali ris yang melebihi 25 cm serta melakukan penanaman berdasar kalender musim tanam untuk mencegah terjadinya serangan hama dan penyakit serta cemaran.Coastal waters of Jeneponto, Bantaeng, and Bulukumba Regencies are the centre of seaweed Kappaphycus alvarezii production in South Sulawesi. Culture management practices applied by farmers in these areas are highly variable. Therefore, this research was conducted to study culture management practices affect the seaweed production in the area. Field survey was conducted by interviewing 62 respondents using questionnaires. The dependent variable in this research was seaweed production, while the independent variables were culture management factors. Multiple regressions with dummy variable were employed to analyze the data to predict seaweed production. The results show that the seaweed productions per one cycle in the south coastal waters of South Sulawesi were ranging from 463 to 5,000 kg dry/3,000 m2. Using long line method, the average yield production was 1,502.3 kg dry/3,000 m2. Culture management practices that affect the seaweed production were distance between ropes, distance between seaweed seeds along the rope, rabbitfish predatory, ice-ice disease, weight of seed, seed origin, and source of pollution. Increasing seaweed production in the south coastal waters of South Sulawesi could be done through increasing weight of seed from 36.9 to 100.0 g/clump, quicker transport of seed, maintaining the distance between the ropes not more than 1.0 m, not increasing the distance between clump along the ropes more than 25 cm along as well as conducting seed planting based on cultivating season to prevent pest diseases and pollution.

Download Full-text