The Tertiary basins are distributed in the eastern margin of the Tibetan Plateau along the large\|scale arc\|shaped strike\|slip belt of the Qiangtang—Hengduan Shan—Jinshajiang—Red River belt. Most of basins were c...The Tertiary basins are distributed in the eastern margin of the Tibetan Plateau along the large\|scale arc\|shaped strike\|slip belt of the Qiangtang—Hengduan Shan—Jinshajiang—Red River belt. Most of basins were controlled by regional northwest\| and south\|north treading faults, and a few basins were constrained by northwest\| or north\|north\|east\|treading local faults.The detailed field mapping and sedimentologic observations for 6 typical Tertiary basins in eastern Tibet show that their types include depressive basins, rifting basins, pull\|apart and extensional basins related to strike\|slip faulting, and erosion\|residual basins. Recently, most of them are controlled by compression\| or thrust\|related margin faults in single side or double laterals of these basins. Not\|well\|developed strata in the Tertiary basins were deformed to form various tight folds and thrusts. High\|K magma intruded widely into the basins. The tectono\|sedimentary evolution of the Tertiary basins appears tempo\|spatially inhomogeneous. The preliminary model to interpret the Tertiary basin evolution is described as below.展开更多
Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the...Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the Batang—Lijiang and Ailao Shan—Red River strike\|slip systems. Although several models were proposed to interpret their petrogenesis (Deng, 1989; Arnaud et al., 1991; Turner et al., 1996; Yin et al., 1995; Miller et al., 1999), their origin still remains hotly debated. Moreover, the published results were only focused on the high\|K igneous rocks resulted from partial melting of an enriched lithospheric mantle. Here, we present the detailed documents to testify the existence of a new kind of high\|K igneous rocks in eastern Tibet.Our new 39 Ar/ 40 Ar age data (Wang et al., 1999) and published age data for high\|K rocks in eastern Tibet show two distinctive magmatic episodes: one between 42Ma and 24Ma, and the other since ca.16Ma. They correspond to two types of high\|K magmatism in eastern Tibet. We name the older and younger groups as types Ⅰ and Ⅱ, respectively.展开更多
文摘The Tertiary basins are distributed in the eastern margin of the Tibetan Plateau along the large\|scale arc\|shaped strike\|slip belt of the Qiangtang—Hengduan Shan—Jinshajiang—Red River belt. Most of basins were controlled by regional northwest\| and south\|north treading faults, and a few basins were constrained by northwest\| or north\|north\|east\|treading local faults.The detailed field mapping and sedimentologic observations for 6 typical Tertiary basins in eastern Tibet show that their types include depressive basins, rifting basins, pull\|apart and extensional basins related to strike\|slip faulting, and erosion\|residual basins. Recently, most of them are controlled by compression\| or thrust\|related margin faults in single side or double laterals of these basins. Not\|well\|developed strata in the Tertiary basins were deformed to form various tight folds and thrusts. High\|K magma intruded widely into the basins. The tectono\|sedimentary evolution of the Tertiary basins appears tempo\|spatially inhomogeneous. The preliminary model to interpret the Tertiary basin evolution is described as below.
文摘Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the Batang—Lijiang and Ailao Shan—Red River strike\|slip systems. Although several models were proposed to interpret their petrogenesis (Deng, 1989; Arnaud et al., 1991; Turner et al., 1996; Yin et al., 1995; Miller et al., 1999), their origin still remains hotly debated. Moreover, the published results were only focused on the high\|K igneous rocks resulted from partial melting of an enriched lithospheric mantle. Here, we present the detailed documents to testify the existence of a new kind of high\|K igneous rocks in eastern Tibet.Our new 39 Ar/ 40 Ar age data (Wang et al., 1999) and published age data for high\|K rocks in eastern Tibet show two distinctive magmatic episodes: one between 42Ma and 24Ma, and the other since ca.16Ma. They correspond to two types of high\|K magmatism in eastern Tibet. We name the older and younger groups as types Ⅰ and Ⅱ, respectively.
