Widespread volcanism associated with Middle Triassic carbonate platforms is well known,and in many cases referred as a partial cause of the disruption of platform development due to burial by volcanic material.It is n...Widespread volcanism associated with Middle Triassic carbonate platforms is well known,and in many cases referred as a partial cause of the disruption of platform development due to burial by volcanic material.It is no doubt that silicic explosive volcanism produced large volume of volcanic material accumulated in basins surrounding the carbonate platforms(Buchenstein basins)alternating with pelagic carbonates of basin facies.There are large numbers of mafic eruptive products associated with individual carbonate platforms such as the Latemar in the Dolomites in northern Italy.展开更多
Rapakivi granite is a postorogenic granite mainly occurring within Precambrian stable blocks in the world. Shahewan rapakivi granite in Qinling. however, is a seldom seen young rock body occurring at the end of Indo-C...Rapakivi granite is a postorogenic granite mainly occurring within Precambrian stable blocks in the world. Shahewan rapakivi granite in Qinling. however, is a seldom seen young rock body occurring at the end of Indo-Chinese epoch (195-213 Ma) and intruding in an orogenic belt. This rock body consists of amphibole-quartz monzonite and amphibole-biotitc adamellite and shows a series of distinctive geological andgeochemical characteristics. It intruded in Shangdan faulted zone--the main suture belt between the NorthChina and Yangtze plates as a result of the delamination of the lithospheric mantle occurring after collision. Presence of Shahewan rapakivi granite marked the end of orogenic stage of subduction-collision from Caled-onian-Hercynian to Indo-Chinese epoch and the transition to intracontinental orogeny in the late orogenic stage.展开更多
基金Project supported by the Hungarian Research Found(OTKA T043341 BT)NZ-FRST Post-doctoral Fellowship(MAUX 405)(KN)and Massey University Research Fund(KN)Constructive reviews by Corina Risso(Buenos Aires)and Peter Suhr(Dresden)significantly elevated the quality of this report,many thanks for them.
文摘Widespread volcanism associated with Middle Triassic carbonate platforms is well known,and in many cases referred as a partial cause of the disruption of platform development due to burial by volcanic material.It is no doubt that silicic explosive volcanism produced large volume of volcanic material accumulated in basins surrounding the carbonate platforms(Buchenstein basins)alternating with pelagic carbonates of basin facies.There are large numbers of mafic eruptive products associated with individual carbonate platforms such as the Latemar in the Dolomites in northern Italy.
基金Project supported by the National Natural Science Foundation of China.
文摘Rapakivi granite is a postorogenic granite mainly occurring within Precambrian stable blocks in the world. Shahewan rapakivi granite in Qinling. however, is a seldom seen young rock body occurring at the end of Indo-Chinese epoch (195-213 Ma) and intruding in an orogenic belt. This rock body consists of amphibole-quartz monzonite and amphibole-biotitc adamellite and shows a series of distinctive geological andgeochemical characteristics. It intruded in Shangdan faulted zone--the main suture belt between the NorthChina and Yangtze plates as a result of the delamination of the lithospheric mantle occurring after collision. Presence of Shahewan rapakivi granite marked the end of orogenic stage of subduction-collision from Caled-onian-Hercynian to Indo-Chinese epoch and the transition to intracontinental orogeny in the late orogenic stage.
