A discontinuous line of ophiolitic bodies occurs along the Yarlung Zangbo Suture Zone (YTSZ), which stretches across southern Tibet and beyond. This zone marks the locus of collision between Eurasia and India in the E...A discontinuous line of ophiolitic bodies occurs along the Yarlung Zangbo Suture Zone (YTSZ), which stretches across southern Tibet and beyond. This zone marks the locus of collision between Eurasia and India in the Early Cenozoic. Should we assume that the entire Tethyan Ocean basin that lay between these two continental blocks was oceanic or might it have been more complex? Fragments of any terranes that developed within this once extensive ocean potentially lie within the YTSZ. Detailed investigations over the past three field seasons reveal the presence of several terranes distributed along this zone. Work is currently underway to analyze the nature of individual terranes and the timing of any inter\|relationships.展开更多
Gangdise tectonic belt, located in the middle part of Tibet—Qinghai plateau Tethys tectonic domain, is the most representative region in Tibet—Qinghai plateau Tethyan evolution especially in Mesozoic era. It is main...Gangdise tectonic belt, located in the middle part of Tibet—Qinghai plateau Tethys tectonic domain, is the most representative region in Tibet—Qinghai plateau Tethyan evolution especially in Mesozoic era. It is mainly covered by thick Jurassic—Cretaceous system layer. During the Mesozoic to Cenozoic era, strong island\|arc types volcanism and volcanic rocks and intrusive rocks belt.. Geologists had divided the Tibet Tethyan evolution into three or four stages (Huang, Jiqing, 1987; Pan Guitang, Li Xinzheng, 1993), according to the ocean\|land conversion process of Tethyan evolution .The Tethyan evolution and the nature of Gangdise tectonic belt had been well\|studied by geologists (Huang Jiqing, 1987; Deng Wanming, 1984; Xia Daixiang, 1986; Cheng Changlun 1987; ZhouXiang 1993; Pan Guitang, 1996). Studies showed that Gangdise tectonic belt, from upper Paleozoic to Mesozoic era, had been developed alternate multiple island arc\|basin system, and characterized by many basin types and strong tectonic\|magma activity. Based on the study of Gangdise multiple island arc\|basin system, I present another version of Gangdise tectonic belt tectonic units division and evolution here.展开更多
The Zedong Terrane forms a discontinuous belt of volcanic and volcaniclastic rocks adjacent to the Yarlung Zangbo River in south eastern Tibet. It extends from Luobusa to 20km west of Zedong. The Zedong Terrane lies w...The Zedong Terrane forms a discontinuous belt of volcanic and volcaniclastic rocks adjacent to the Yarlung Zangbo River in south eastern Tibet. It extends from Luobusa to 20km west of Zedong. The Zedong Terrane lies within the Indus—Yarlung Zangbo suture zone and may represent an intra\|oceanic island arc that once lay between the Lhasa (Asian) and Himalayan (Indian) terranes. Rare fossils within the terrane indicate active volcanism during the Early Cretaceous.Ultramafic rocks of the Dazhuqu Terrane, including harzburgite and gabbro are thrust over the southern margin of the Zedong Terrane along a steep south\|dipping thrust fault. To the west of Zedong, this fault is marked by a distinctive zone of serpentinite. East of Zedong, the northernmost rocks of the terrane are thrust onto Oligocene molasse deposits of the Luobusa Formation and Cretaceous plutonic rocks of the Gangdese batholith (Lhasa Terrane). These thrusts form part of a northward directed thrust stack \| the Renbu\|Zedong thrust system of Yin et al.., (1994, 1999).展开更多
文摘A discontinuous line of ophiolitic bodies occurs along the Yarlung Zangbo Suture Zone (YTSZ), which stretches across southern Tibet and beyond. This zone marks the locus of collision between Eurasia and India in the Early Cenozoic. Should we assume that the entire Tethyan Ocean basin that lay between these two continental blocks was oceanic or might it have been more complex? Fragments of any terranes that developed within this once extensive ocean potentially lie within the YTSZ. Detailed investigations over the past three field seasons reveal the presence of several terranes distributed along this zone. Work is currently underway to analyze the nature of individual terranes and the timing of any inter\|relationships.
文摘Gangdise tectonic belt, located in the middle part of Tibet—Qinghai plateau Tethys tectonic domain, is the most representative region in Tibet—Qinghai plateau Tethyan evolution especially in Mesozoic era. It is mainly covered by thick Jurassic—Cretaceous system layer. During the Mesozoic to Cenozoic era, strong island\|arc types volcanism and volcanic rocks and intrusive rocks belt.. Geologists had divided the Tibet Tethyan evolution into three or four stages (Huang, Jiqing, 1987; Pan Guitang, Li Xinzheng, 1993), according to the ocean\|land conversion process of Tethyan evolution .The Tethyan evolution and the nature of Gangdise tectonic belt had been well\|studied by geologists (Huang Jiqing, 1987; Deng Wanming, 1984; Xia Daixiang, 1986; Cheng Changlun 1987; ZhouXiang 1993; Pan Guitang, 1996). Studies showed that Gangdise tectonic belt, from upper Paleozoic to Mesozoic era, had been developed alternate multiple island arc\|basin system, and characterized by many basin types and strong tectonic\|magma activity. Based on the study of Gangdise multiple island arc\|basin system, I present another version of Gangdise tectonic belt tectonic units division and evolution here.
文摘The Zedong Terrane forms a discontinuous belt of volcanic and volcaniclastic rocks adjacent to the Yarlung Zangbo River in south eastern Tibet. It extends from Luobusa to 20km west of Zedong. The Zedong Terrane lies within the Indus—Yarlung Zangbo suture zone and may represent an intra\|oceanic island arc that once lay between the Lhasa (Asian) and Himalayan (Indian) terranes. Rare fossils within the terrane indicate active volcanism during the Early Cretaceous.Ultramafic rocks of the Dazhuqu Terrane, including harzburgite and gabbro are thrust over the southern margin of the Zedong Terrane along a steep south\|dipping thrust fault. To the west of Zedong, this fault is marked by a distinctive zone of serpentinite. East of Zedong, the northernmost rocks of the terrane are thrust onto Oligocene molasse deposits of the Luobusa Formation and Cretaceous plutonic rocks of the Gangdese batholith (Lhasa Terrane). These thrusts form part of a northward directed thrust stack \| the Renbu\|Zedong thrust system of Yin et al.., (1994, 1999).
