ARCHITECTURE, PROCESS, AND ENVIRONMENTAL DIVERSITY IN A LATE CRETACEOUS SLOPE CHANNEL SYSTEM

Kneller, Benjamin1; Bozetti, Guilherme1,5; Callow, Richard1,3; Dykstra, Mason2; Hansen, Larissa1,6; Kane, Ian3,7; Li, Pan1,8; Mcarthur, Adam4,6; Santa Catharina, Amanda1; Dos Santos, Thisiane1; Thompson, Philip1,9

2020-01

10.2110/jsr.2020.1

JOURNAL OF SEDIMENTARY RESEARCH   影响因子和分区

1527-1404

1938-3681

Arroyo San Fernando, on the Pacific coast of Baja California, Mexico, provides a superb view of the architecture of a Maastrichtian active margin slope channel system and the record of its evolution through a third-order sea-level cycle. The succession is organized into architectural building blocks (channel-complex sets) consisting of a channel belt with an axial region and a channel-belt margin of terraces and internal levees. The channel belt is confined by an external levee on one side and by an erosion surface into the slope on the other. Each channel-complex set can be subdivided into three stages of evolution: Stage 1 consists of highly amalgamated coarse-grained channel complexes, Stage H consists of gravelly meander belts with marginal and stratigraphically intervening thin-bedded turbidites, and Stage III consists of mudstones representing abandonment. This succession is associated with repeated and therefore predictable changes in architecture, facies distribution, inferred seafloor morphology, and sedimentary process. We describe variability in the sedimentology, ichnology, palynology, provenance, and inferred sedimentary processes between and within these architectural elements. Channel formation and fill are attributed to erosion, sediment transport, and deposition by turbidity currents and lesser debris flows. Ichnology indicates enhanced oxygenation and supply of organic material, substrate type, and turbidity within the channel belt; the axial region can be differentiated from the terraces by differing response to turbidity current intensity. Levee environments show ichnological gradients away from the channel towards background slope. Palynology reflects confinement of the supply of terrigenous material to the channel belt, but is also indicative of stratification within the turbidity currents, as is the distribution of heavy minerals. Provenance is from the extinct part of the continental margin arc to the east, via high-gradient gravelly streams and across a steep shoreline, with direct supply of coastal material to deep water. Architectural hierarchy bears comparison with other slope channel systems, but in common with them the fill represents only a small fraction of the time that the system was active.

SCI ; EI

英语

其他

Geology

Geology

WOS:000512929300001

SEPM-SOC SEDIMENTARY GEOLOGY

20211810283256

Computer architecture ; Embankments ; Erosion ; Levees ; Minerals ; Morphology ; Ocean currents ; Sea level ; Sediment transport ; Sedimentology ; Turbidity

Buildings and Towers:402 ; Construction Equipment and Methods; Surveying:405 ; Flood Control:442.1 ; Oceanography, General:471.1 ; Seawater, Tides and Waves:471.4 ; Geology:481.1 ; Minerals:482.2 ; Soil Mechanics and Foundations:483 ; Light/Optics:741.1 ; Materials Science:951

GEOSCIENCES

Web of Science

1.Univ Aberdeen, Sch Geosci, Aberdeen AB24 3UE, Scotland
2.Occidental Petr, 1201 Lake Robbins Dr, The Woodlands, TX 77380 USA
3.Equinor ASA, N-4035 Stavanger, Norway
4.Univ Fed Rio Grande do Sul, Ave Paulo Gama 110, Porto Alegre, RS, Brazil
5.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, 1088 Xueyuan Rd, Shenzhen 518055, Peoples R China
6.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
7.Univ Manchester, Sch Earth & Environm Sci, Oxford Rd, Manchester M13 9PL, Lancs, England
8.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
9.Shell Int Ltd, 40 Bank St, London E14 5NR, England

Kneller, Benjamin,Bozetti, Guilherme,Callow, Richard,et al. ARCHITECTURE, PROCESS, AND ENVIRONMENTAL DIVERSITY IN A LATE CRETACEOUS SLOPE CHANNEL SYSTEM[J]. JOURNAL OF SEDIMENTARY RESEARCH,2020,90(1):1-26.

Kneller, Benjamin.,Bozetti, Guilherme.,Callow, Richard.,Dykstra, Mason.,Hansen, Larissa.,...&Thompson, Philip.(2020).ARCHITECTURE, PROCESS, AND ENVIRONMENTAL DIVERSITY IN A LATE CRETACEOUS SLOPE CHANNEL SYSTEM.JOURNAL OF SEDIMENTARY RESEARCH,90(1),1-26.

Kneller, Benjamin,et al."ARCHITECTURE, PROCESS, AND ENVIRONMENTAL DIVERSITY IN A LATE CRETACEOUS SLOPE CHANNEL SYSTEM".JOURNAL OF SEDIMENTARY RESEARCH 90.1(2020):1-26.