Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.2110/jsr.2017.47 |
A DISCONTINUOUS EPHEMERAL STREAM TRANSPORTING MUD AGGREGATES IN A CONTINENTAL RIFT BASIN: THE LATE TRIASSIC MALERI FORMATION, INDIA | |
Dasgupta, Sanghita1; Ghosh, Parthasarathi1; Gierlowski-Kordesch, Elizabeth H.2 | |
通讯作者 | Dasgupta, Sanghita |
来源期刊 | JOURNAL OF SEDIMENTARY RESEARCH |
ISSN | 1527-1404 |
EISSN | 1938-3681 |
出版年 | 2017 |
卷号 | 87期号:8页码:838-865 |
英文摘要 | Finer-grained components of fluvial sediments are usually deposited in overbank environments, and their preservation in the rock record is generally subordinate to that of the coarser-grained channel fills. However, though the fossil record and lithological characteristics of the Late Triassic Maleri Formation, Gondwana Supergroup of the Pranhita-Godavari continental rift basin, India, indicate that it is a fluvial deposit, the formation is characterized by thin sandstone bodies vertically separated by thicker fine-grained sediments. With the help of petrographic and sedimentological features, this study characterizes the fluvial system that produced a deposit dominated by fines. These syn-rift sediments provide valuable clues towards understanding the spectrum of fluvial processes operating in continental rift-basins. We observe that the formation is dominated by stratified siltstone (mudrocks) rather than massive mudstones. These mudrocks contain a large quantity of silt to fine-sand-size pedogenic mud aggregates, and the preserved primary structures indicate transportation by traction currents. The internal organization of the mudrock units reveals that an admixture of pedogenic mud aggregates along with other sand-grade siliciclastic grains were transported through the channelized and unconfined reaches of a network of discontinuous ephemeral streams constituting the axial drainage of the rift basin. However, evidence for accumulation of fines in swamp-like environments is preserved in a few pedogenically modified mudstones that occur in between much thicker intervals of stratified mudrocks. On the other hand, the small bodies of cross-bedded carbonate grainstones and laminated marls indicate that the conditions suitable for precipitation of freshwater carbonates prevailed in some of these swampy areas. The sedimentary features of the thinner sheet-sandstone bodies associated with the mudrocks suggest that though the overall character of the fluvial system remained unchanged the sandstones were deposited during the phases of higher discharge. We suggest that the basin was persistently fed with a sediment load rich in mud aggregate produced in the vertic soils forming on the shales and limestones in the source area under a warm climate and seasonal rainfall. |
类型 | Article |
语种 | 英语 |
国家 | India ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000408529200005 |
WOS关键词 | PRANHITA-GODAVARI-VALLEY ; ARID CENTRAL AUSTRALIA ; DRYLAND RIVER SYSTEMS ; OLD RED SANDSTONE ; STAGE PLANE BEDS ; CARBONATE DEPOSITION ; FLOOD DEPOSITS ; PALUSTRINE CARBONATES ; TRAVERTINE DEPOSITS ; ANASTOMOSING RIVERS |
WOS类目 | Geology |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/200786 |
作者单位 | 1.Indian Stat Inst, Geol Studies Unit, 203 BT Rd, Kolkata 700108, India; 2.Ohio Univ, Dept Geol Sci, Athens, OH 45701 USA |
推荐引用方式 GB/T 7714 | Dasgupta, Sanghita,Ghosh, Parthasarathi,Gierlowski-Kordesch, Elizabeth H.. A DISCONTINUOUS EPHEMERAL STREAM TRANSPORTING MUD AGGREGATES IN A CONTINENTAL RIFT BASIN: THE LATE TRIASSIC MALERI FORMATION, INDIA[J],2017,87(8):838-865. |
APA | Dasgupta, Sanghita,Ghosh, Parthasarathi,&Gierlowski-Kordesch, Elizabeth H..(2017).A DISCONTINUOUS EPHEMERAL STREAM TRANSPORTING MUD AGGREGATES IN A CONTINENTAL RIFT BASIN: THE LATE TRIASSIC MALERI FORMATION, INDIA.JOURNAL OF SEDIMENTARY RESEARCH,87(8),838-865. |
MLA | Dasgupta, Sanghita,et al."A DISCONTINUOUS EPHEMERAL STREAM TRANSPORTING MUD AGGREGATES IN A CONTINENTAL RIFT BASIN: THE LATE TRIASSIC MALERI FORMATION, INDIA".JOURNAL OF SEDIMENTARY RESEARCH 87.8(2017):838-865. |
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