 |
| Titel |
The distribution and tectonic framework of Late Paleozoic volcanoes in the Junggar basin and its adjacent area, NW China |
| VerfasserIn |
X. Mao, J. H. Li |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060548
|
|
|
|
|
|
| Zusammenfassung |
| We analyse the distribution and characteristics of 145 late Paleozoic volcanoes in north
Xinjiang, NW China, including 32 volcanoes on the edge of the Junggar basin. These
volcanoes are clustered and can be divided into calderas, volcanic domes, and volcanic
necks. There are also 85 volcanoes inside the Junggar basin, which are dominantly
distributed in the Ke-Bai fractured zone of the northwestern margin of Junggar Basin, 4
depressions (Dongdaohaizi Depression, Dishuiquan Depression, Sannan Depression and
Wucaiwan Depression) and 7 uplifts (Baijiahai uplift, Beisantai uplift, Dibei uplift,
Dinan uplift, Sangequan uplift, Shixi uplift and Xiayan uplift). The volcanoes inside
the basin are principally controlled by Hercynian Fault Systems, along NE and
nearly EW trending faults and most developed in the interjunctions of the faults.
The long modification by late-stage weathering and leaching made the volcanoes
difficult to identify. Remaining volcanic landforms, changing trends of the volcanic
lithofacies and the typical volcanic rock, such as the crypto- explosive breccia, are
the typical marks of the late Paleozoic volcanoes in the field; and the concealed
volcanic edifices are identified by the techniques of seismic identification, such as
seismic slicing, analysis of the attribute and tectonic trend plane. The ages of the
volcanic rocks are focused on from 340 Ma to 320Ma and from 300 Ma to 295
Ma, corresponding to the subducting periods of West Junggar and East Junggar.
From early Carboniferous to late Carboniferous, the volcanic activities in Junggar
Basin and its adjacent areas show a variation trend from undersea to continental,
from deep water to shallow water and from continental margin to intracontinental. |
|
|
|
|
|
|