ACTA CARSOLOGICA 是几区的-刊鹿论文编译

Late Pleistocene lacustrine sediments and their relation to red soils in the Northeastern margin of the Dinaric Karst

Abstract:

A large karst doline at section Hrastje – Lesnica in the Dolenjska region (SE Slovenia) was uncovered during the construction of Slovene highway No. A2. Its fill consists of brownish-yellow clay to silt with plant remains and ferrugineous coatings after root casts and gastropods (paleosol horizon) in the bottom, and overlying thick lacustrine laminated grey clayey sediments which were partly rubified. Brownish-yellow clay to silt contains quartz, chlorite, muscovite and feldspars transported as external clastic material from evolved karst and non-carbonate landscapes from surroundings into the site. The material is well weathered only in the area of the paleosol horizon. The strongly impoverished malacocoenosis indicates any Quaternary warm phase characterized by light semi-open forest with patches of open ground habitats. Only the last paleomagnetic sample in the bottom of sediment sequence shows reverse polarity of magnetic field and represents the geomagnetic excursion, i.e., the Blake excursion at ca 120–112 ka (MIS 5e), rather than Brunhes/Matuyama boundary at 0.78 Ma (MIS 19). Thick lacustrine laminated grey clayey sediments above are also dominated by quartz, muscovite, chlorite and feldspar. That overlying sediment was almost unweathered (content of feldspars, muscovite and chlorite); it was only slightly rubified on its surface, in middle part of the section and at the contact with the underlying karstified limestone slope of the depression. The grey sediment has a different mineralogical composition than underlying soils (e.g., lack of quartz, chlorite) and non-carbonate residue of the host limestone. Therefore, the grey sediments could not serve as a parent (source) material for terra rossa formation in the broader area (i.e., polygenetic red soils developed in paleoclimate related to current Mediterranean climatic conditions). Laminated grey sediment was deposited in a rather cold climate. Relatively poor palynospectra may indicate transport of pollen grains out of the depocentre with flowing water and/or the rapid deposition. The latter is supported by insufficiently centered paleosecular variations. Plant assemblages indicate that the dominant cover of the surrounding landscape was temperate climatic zone riparian forest with some quite humid environment as wetlands and ponds on periodically flooded plain. The regional correlation, based especially on an abundance of Fagus, indicates the deposition at the beginning of the last glacial cycle (Wurmian) in its warmer substage – MIS 5c (ca 105–95 ka). All paleomagnetic samples from this part of the sediment section show normal magnetization and negligible clockwise rotation of 1.8° ± 4.7°. Key words: karst sediments, mineralogy, gastropods, palynology, paleomagnetism, paleoenvironment, Dolenjska region, Slovenia. Pozno pleistocenski jezerski sedimenti in njihova povezava z rdecimi tlemi na severovzhodnem robu Dinarskega krasa Na Dolenjskem krasu je bila med graditvijo trase A2 slovenskega avtocestnega križa na odseku Hrastje–Lesnica razgaljena vecja vrtaca. V spodnjem delu je bila povsem zapolnjena z rjavkastorumenim sedimentom glinene do meljaste frakcije, v zgornjem delu pa z debelim zaporedjem laminiranega sivega glinenega sedimenta, ki je bil ponekod rahlo rubificiran. Rjavkasto rumeni glineni do meljasti sediment na dnu vrtace, v katerem so posamezni rastlinski ostanki, s koreninami povezane ferigene skorje in gastropodi (paleotalni horizont), vsebuje kremen, klorit, muskovit in plagioklaze. Ti so bili preneseni v vrtaco kot klasticni material z bližnjih obmocij razvijajocega se kraskega in nekarbonatnega (fluvialnega) povrsja. Dobro preperel material je le v obmocju paleotalnega horizonta. Mocno osiromasena malakocenoza nakazuje eno od toplih faz kvartarja, ko so prevladovali svetli gozdovi z redkimi drevesi in jasami odprtih talnih habitatov. Samo zadnji od paleomagnetnih vzorcev na dnu raziskanega sedimentnega zaporedja kaže reverzno polarnost magnetnega polja. Menimo, da ta reverzna polarnost kaže na t. i. Blakeovo geomagnetno ekskurzijo pred cca 120.000 in 112.000 leti (MIS 5e) in ne meje Brunhes/Matuyama pred 780.000 leti (MIS 19). Tudi v debelem zaporedju sivih laminiranih glinastih jezerskih sedimentov prevladujejo med minerali kremen, muskovit, klorit in glinenci. Glede na ohranjenost glinenih mineralov, muskovita in klorita sklepamo, da so ti sedimenti skoraj neprepereli; rahlo so rubificirani le na povrsju, v osrednjem delu profila in na stiku z zakraselo podlago vrtace. Mineraloska sestava sivih sedimentov je drugacna kot v spodaj ležecem talnem horizontu, kjer je manj kremena in klorita, razlikuje pa se tudi od nekarbonatnega preperinskega ostanka apnencaste prikamnine. Kot tak torej siv sediment ni izvorni material na sosednjih obmocjih pogoste terre rosse (poligenetska rdeca tla, razvita v pleoklimatskih razmerah, podobnih danasnjemu mediteranskemu podnebju). Laminirani sedimenti so se odložili v razmeroma hladnem obdobju. Dokaj siromasen palinospekter lahko kaže po eni strani, da so bila pelodna zrna odstranjena iz depocentra s tekoco vodo, po drugi pa na visoko hitrost sedimentacije. V prid temu procesu pritrjujejo tudi premalo centrirane paleosekularne variacije. Rastlinske združbe nakazujejo, da je bila bližnja okolica v glavnem porasla z obrežnimi gozdovi zmernega podnebnega pasu, kjer so se v humidnih obdobjih poplavljenih ravnic obcasno pojavljala tudi mokrisca in manjse ojezeritve. Regionalne korelacije, ki temeljijo predvsem na veliki kolicini pelodov bukve (Fagus) kažejo, da so se sivi glinasti sedimenti odlagali v toplejsem obdobju na zacetku zadnjega poledenitvenega cikla (Wurm) med t. i. MIS 5c pred okoli 105.000 do 95.000 leti. Vsi paleomagnetni vzorci tega dela sedimentnega profila kažejo normalno magnetizacijo in zanemarljivo rotacijo 1,8° ± 4,7° v smeri urinega kazalca. Kljucne besede: kraski sedimenti, mineralogija, polži, palinologija, paleomagnetizem, paleookolje, Dolenjska, Slovenija.

Author Listing： Nadja Zupan Hajna;Bojan Otoničar;Petr Pruner;Metka Culiberg;Jaroslav Hlaváč;Oleg Mandic;Roman Skála;Pavel Bosák

Volume： 48

Pages： None

DOI： 10.3986/ac.v48i2.7080

Language： English

Journal： Acta Carsologica

ACTA CARSOLOGICA

影响因子：1.0

是否综述期刊：否

是否OA：否

是否预警：不在预警名单内

发行时间：-

ISSN：0583-6050

发刊频率：Tri-annual

收录数据库：SCIE/Scopus收录

出版国家/地区：SLOVENIA

出版社：Zalozba Z R C

期刊介绍

Karst areas occupy 10-20 % of ice-free land. Dissolution of rock by natural waters has given rise to specific landscape and underground. Karst surface features and caves have attracted man's curiosity since the dawn of humanity and have been a focus to scientific studies since more than half of millennia.Acta Carsologica publishes original research papers and reviews, letters, essays and reports covering topics related to specific of karst areas. These comprise, but are not limited to karst geology, hydrology, and geomorphology, speleology, hydrogeology, biospeleology and history of karst science.

喀斯特地区占无冰陆地的 10 - 20% 。岩石被天然水溶解，形成了特殊的景观和地下。自人类诞生以来，喀斯特地貌和洞穴就一直吸引着人们的好奇心，并在超过 5000 年的时间里成为科学研究的焦点。 Acta Carsologica 出版原创研究论文和评论、信件、散文和报告，涵盖了与喀斯特地区相关的主题。这些包括但不限于喀斯特地质学、水文学、地貌学、洞穴学、水文地质学、生物洞穴学和喀斯特科学史。

年发文量	15
国人发稿量	1
国人发文占比	6.67%
自引率	10.0%
平均录取率	容易
平均审稿周期	>12周，或约稿
版面费	-
偏重研究方向	地学-地球科学综合
期刊官网	http://ojs.zrc-sazu.si/carsologica
投稿链接	http://ojs.zrc-sazu.si/carsologica/about/submissions#onlineSubmissions

质量指标占比

研究类文章占比	OA被引用占比	撤稿占比	出版后修正文章占比
100.00%	95.56%	-	-

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