| 000 | 02605nab a2200253 4500 | ||
|---|---|---|---|
| 005 | 20260520000314.0 | ||
| 008 | 260224s2011 xxu | ||
| 245 | 0 | 0 | _aThree-dimensional seismic geomorphology and analysis of the Ordovician paleokarst drainage system in the central Tabei Uplift, northern Tarim Basin, western China |
| 260 |
_a _b _cdic. 2011 |
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| 270 | _a27/03/2012 ; 27/03/2012 | ||
| 300 | _a22 p. ; 2061-2083 | ||
| 520 | _aTranscripción del resumen del autor: High-quality three-dimensional seismic data acquired in the central Tabei Uplift, Tarim Basin, western China, provide a rare opportunity to characterize in exceptional detail the three-dimensional geomorphology of a deeply buried (5500–6500 m [18,045–21,325 ft]) Ordovician unconformity and the related paleokarst drainage system. An integrated approach was applied that emphasized integration of seismic data with available conventional core, wireline logs, and age-equivalent outcrops. The exceptional quality of the seismic data allowed a seismic detection limit of karstified features of less than 75 × 75 m (246 × 246 ft) horizontally and 6 m (20 ft) vertically. Interpreted geomorphologic and depositional elements include fluvial channels and canyons, fluvial valleys, sinkholes, and tower karsts and hills. The modern tower karst-drainage system in Guilin, China, is very similar to the mapped Ordovician karst-drainage system and is used as a modern analog. The interaction between the surface karst-drainage system and the shallow-subsurface cave-passage system is evidenced by the observation that surface canyons appear to initiate in areas associated with intense sinkhole development. Also, surface river valleys tend to correspond to dip-oriented surface depressions partly related to near-surface cave collapse. During burial into the deeper subsurface, the combination of intrastratal collapse (karstified strata) and suprastratal collapse (postkarst-deposited strata) created large damage zones hundreds of meters thick and kilometers wide. Coalesced-collapsed paleocave systems can be interpreted from the unique circular pattern of faults (observed in map view) that are associated with seismic bright spots. | ||
| 581 | _a12 | ||
| 773 | 0 |
_tAAPG Bulletin _g95 |
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| 942 | _cARTICULO | ||
| 100 | 1 |
_aZeng, Hongliu _926057 |
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| 100 | 1 |
_aLoucks, Robert _944356 |
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| 100 | 1 |
_aJanson, Xavier _944355 |
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| 100 | 1 |
_aWang, Guizhong _952228 |
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| 100 | 1 |
_aXia, Yiping _952229 |
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| 100 | 1 |
_aYuan, Bingheng _952230 |
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| 100 | 1 |
_aXu, Ligui _952231 |
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| 999 |
_c186902 _d186902 |
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