中新世Macaronichnus痕迹化石的新浅海高纬度记录,重新加工的三角洲前斜形,Punta Basílica,火地岛,阿根廷

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
E. Olivero, M. L. López Cabrera
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引用次数: 2

摘要

摘要在火地岛中新世下部Punta Basílica地层中发现了一种新的高纬记录的Macaronichnus segregatis degiberti化石,该地层以前被认为是深海水道和堤岸沉积。然而,在综合技术和沉积学研究的基础上,这些地层被重新解释为浅海三角洲前缘斜状沉积。地层较老的斜形岩中含通心粉砂层的特征是:(1)具有波纹和波纹交叉层状的砂岩;(2)交错层状砂岩,形成大型复合沙丘和潮坝;(3)介入性杂石器泥岩-砂岩对联,具有水流和波浪波纹。保存M. s. degiberti沉积相是在海侵开始时形成的,表现为下伏陡倾的三角洲前缘斜形沉积的波浪和潮汐改造作用。复合潮坝的主层理表面具有致密的单一特异的m.s. degiberti织物特征。与其他Macaronichnus ichnofabric相比,其他地方报道的Macaronichnus ichnofabric在潮汐沙丘或沙洲的森林上具有较短的殖民窗口,Punta Basílica ichnofabric代表了较长的殖民窗口,与主层状表面上松散的、富含营养的沙粒的间歇性改造和再沉积有关。m.s. degiberti在火地岛的记录支持了先前的解释,即它的生产者仅限于高纬度、浅海寒冷的水域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A new shallow-marine, high-latitude record of the trace fossil Macaronichnus in Miocene, reworked delta-front clinoforms, Punta Basílica, Tierra Del Fuego, Argentina
Abstract A new high-latitude record of the trace fossil Macaronichnus segregatis degiberti is documented from the lower Miocene Punta Basílica beds, Tierra del Fuego, which were previously considered to be deep-marine channel and levee deposits. Based on a combined ichnological and sedimentological study, however, these beds are herein re-interpreted as shallow-marine, delta-front clinoform deposits. Macaronichnus-bearing beds in the stratigraphically older clinoforms are characterized by: (1) sandstones with wave ripples and wave-ripple cross-lamination; (2) cross-stratified sandstones forming large compound dunes and tidal bars; and (3) intervening heterolithic mudstone-sandstone couplets with current and wave ripples. The sedimentary facies preserving M. s. degiberti were deposited during the onset of transgression, indicated by wave and tide reworking of underlying steeply dipping, delta-front clinoforms deposits. The master bedding surfaces of compound tidal bars are characterized by a dense, monospecific fabric of M. s. degiberti. Compared with other Macaronichnus ichnofabrics, reported elsewhere as characterizing short colonization windows on foresets of tidal dunes or bars, the Punta Basílica ichnofabric represents a longer colonization window, associated with episodic reworking and redeposition of loose, nutrient-rich sand grains just above the master bedding surfaces. The record of M. s. degiberti in Tierra del Fuego supports the previous interpretations that restrain its producer to high-latitude, shallow-marine cold waters.
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来源期刊
CiteScore
2.50
自引率
12.50%
发文量
0
审稿时长
>12 weeks
期刊介绍: The foremost aim of Ichnos is to promote excellence in ichnologic research. Primary emphases center upon the ethologic and ecologic significance of tracemaking organisms; organism-substrate interrelationships; and the role of biogenic processes in environmental reconstruction, sediment dynamics, sequence or event stratigraphy, biogeochemistry, and sedimentary diagenesis. Each contribution rests upon a firm taxonomic foundation, although papers dealing solely with systematics and nomenclature may have less priority than those dealing with conceptual and interpretive aspects of ichnology. Contributions from biologists and geologists are equally welcome. The format for Ichnos is designed to accommodate several types of manuscripts, including Research Articles (comprehensive articles dealing with original, fundamental research in ichnology), and Short Communications (short, succinct papers treating certain aspects of the history of ichnology, book reviews, news and notes, or invited comments dealing with current or contentious issues). The large page size and two-column format lend flexibility to the design of tables and illustrations. Thorough but timely reviews and rapid publication of manuscripts are integral parts of the process.
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