气候变化领域集成服务门户(CCPortal): Late Quaternary subsidence of Santa Catalina Island, California Continental Borderland, demonstrated by seismic-reflection data and fossil assemblages from submerged marine terraces

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DOI	10.1130/B31738.1
	Late Quaternary subsidence of Santa Catalina Island, California Continental Borderland, demonstrated by seismic-reflection data and fossil assemblages from submerged marine terraces
	Castillo C.M.; Klemperer S.L.; Ingle J.C.; Jr.; Powell C.L.; II; Legg M.R.; Francis R.D.
发表日期	2019
ISSN	167606
起始页码	21
结束页码	42
卷号	131 期号:2021-01-02
英文摘要	Submerged paleoshorelines and terraces surrounding Santa Catalina Island and the Pilgrim/Kidney Banks in the California Continental Borderland demonstrate late Quaternary tectonic subsidence, in contrast to the other islands of the California Continental Borderland that are experiencing tectonic uplift. We used high-resolution seismicreflection profiles to map a terrace package containing 16 successive parasequences surrounding Santa Catalina Island, preserved at depths from 30 to 470 m below modern mean sea level. The Pilgrim/Kidney Banks are surrounded by a terrace package containing 13 successive parasequences preserved at 90- 310 m depth. The presence of marine terrace (beach) deposits at > 400 m depth, far below the lowest estimates of Quaternary lowstand sea level (90-130 m), requires significant tectonic subsidence. Within each terrace, we identified the transgressive surface separating subaerial deltaic and shallow-marine deposits originating during sea-level lowstand from overlying subaqueous deltaic deposits emplaced after the lowstand. Remotely operated vehicle samples of sediment recovered from submerged terrace deposits offshore Santa Catalina Island contain faunal assemblages typical of submerged insular terraces in southern California. The distribution of equivalent extant mollusks and benthic foraminifera indicates deposition in water depths between 25 and 45 m. Extinct taxa present within the samples provide coarse (Late Pleistocene) age constraints on Santa Catalina's deepest subsided terraces. We identified the transgressive surface corresponding to the Last Glacial Maximum and its paleo-sea-level marker at modern depths between -85 and -95 m surrounding Santa Catalina Island. Terraces surrounding Santa Catalina Island and Pilgrim Banks were correlated to lowstands and interstadials on a glacio-isostatic-adjusted, ice-volume-equivalent sea-level curve in order to evaluate subsidence rates. Santa Catalina Island has been tilting north and subsiding together with its surrounding platform at 0.08-0.27 mm/yr since at least 1.15 Ma (marine oxygen isotope stage [MIS] 34). Pilgrim Banks has been subsiding at 0.3 mm/yr for at least 0.35 m.y. but must have subsided no faster than 0.12 mm/yr between 0.35 and 1.15 Ma. We interpret the subsidence and 1.5° northward tilt of Santa Catalina Island as showing continued, although reduced, activity of the Catalina fault system simultaneous with increasing activity on the southern San Pedro Basin-San Diego Trough fault zone. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184968
作者单位	Department of Geophysics, Stanford University, Mitchell Building, 397 Panama Mall, Stanford, CA 94305, United States; U.S. Geological Survey, Western Region Geology and Geophysics Science Center, 345 Middlefield Road, Menlo Park, CA 94025, United States; Legg Geophysical, 16541 Gothard Street, #107, Huntington Beach, CA 92647, United States; Department of Geological Sciences, California State University-Long Beach, 1250 Bellflower Boulevard, Long Beach, CA 90840, United States
推荐引用方式 GB/T 7714	Castillo C.M.,Klemperer S.L.,Ingle J.C.,et al. Late Quaternary subsidence of Santa Catalina Island, California Continental Borderland, demonstrated by seismic-reflection data and fossil assemblages from submerged marine terraces[J],2019,131(2021-01-02).
APA	Castillo C.M..,Klemperer S.L..,Ingle J.C..,Jr..,Powell C.L..,...&Francis R.D..(2019).Late Quaternary subsidence of Santa Catalina Island, California Continental Borderland, demonstrated by seismic-reflection data and fossil assemblages from submerged marine terraces.Bulletin of the Geological Society of America,131(2021-01-02).
MLA	Castillo C.M.,et al."Late Quaternary subsidence of Santa Catalina Island, California Continental Borderland, demonstrated by seismic-reflection data and fossil assemblages from submerged marine terraces".Bulletin of the Geological Society of America 131.2021-01-02(2019).