Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31757.1 |
Timing of deep-water slope evolution constrained by large-n detrital and volcanic ash zircon geochronology, Cretaceous Magallanes Basin, Chile | |
Daniels, Benjamin G.1; Auchter, Neal C.2; Hubbard, Stephen M.1; Romans, Brian W.2; Matthews, William A.1; Stright, Lisa3 | |
2018-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:438-454 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | Deciphering depositional age from deposits that accumulate in deep-water slope settings can enhance understanding of shelf-margin evolutionary timing, as well as controlling mechanisms in ancient systems worldwide. Basin analysis has long employed biostratigraphy and/or tephrochronology to temporally constrain ancient environments. However, due to poor preservation of index fossils and volcanic ash beds in many deep-water systems, deducing the timing of slope evolution has proven challenging. Here, we present >6600 new U-Pb zircon ages with stratigraphic information from an similar to 100-km-long by similar to 2.5-km-thick outcrop belt to elucidate evolutionary timing for a Campanian-Maastrichtian slope succession in the Magallanes Basin, Chile. Results show that the succession consists of four stratigraphic intervals, which characterize four evolutionary phases of the slope system. Overall, the succession records 9.9 +/- 1.4 m.y. (80.5 +/- 0.3 Ma to 70.6 +/- 1.5 Ma) of graded clinoform development punctuated by out-of-grade periods distinguished by enhanced coarse-grained sediment bypass downslope. Synthesis of our results with geochronologic, structural, and stratigraphic data from the basin suggests that slope evolution was largely controlled by an overall decline in basin subsidence from 82 to 74 Ma. In addition to providing insight into slope evolution, our results show that the reliability of zircon-derived depositional duration estimates for ancient sedimentary systems is controlled by: (1) the proportion of syndepositionally formed zircon in a strati-graphic interval; (2) the magnitude of the uncertainty on interval-bounding depositional ages relative to the length of time evaluated; and (3) the geologic time (i.e., period/era) over which the system was active. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427362500005 |
WOS关键词 | TRES PASOS FORMATION ; PATAGONIAN ANDES OROGENY ; SEDIMENT-ROUTING SYSTEM ; RETROARC FORELAND BASIN ; CERRO-TORO FORMATION ; BACK-ARC BASIN ; U-PB AGES ; LA-ICP-MS ; SOUTHERN CHILE ; SHELF-MARGIN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24925 |
专题 | 地球科学 |
作者单位 | 1.Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada; 2.Virginia Tech, Dept Geosci, 926 West Campus Dr, Blacksburg, VA 24061 USA; 3.Colorado State Univ, Dept Geosci, 1482 Campus Delivery, Ft Collins, CO 80523 USA |
推荐引用方式 GB/T 7714 | Daniels, Benjamin G.,Auchter, Neal C.,Hubbard, Stephen M.,et al. Timing of deep-water slope evolution constrained by large-n detrital and volcanic ash zircon geochronology, Cretaceous Magallanes Basin, Chile[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:438-454. |
APA | Daniels, Benjamin G.,Auchter, Neal C.,Hubbard, Stephen M.,Romans, Brian W.,Matthews, William A.,&Stright, Lisa.(2018).Timing of deep-water slope evolution constrained by large-n detrital and volcanic ash zircon geochronology, Cretaceous Magallanes Basin, Chile.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,438-454. |
MLA | Daniels, Benjamin G.,et al."Timing of deep-water slope evolution constrained by large-n detrital and volcanic ash zircon geochronology, Cretaceous Magallanes Basin, Chile".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):438-454. |
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