本文選題：水溝—會興溝舊石器遺址　切入點：黃土—古土壤序列　出處：《地球科學進展》2017年05期 　論文類型：期刊論文

【摘要】：巖石磁學是古地磁學和環(huán)境磁學研究的基礎,是鑒定巖石和沉積物中磁性礦物種類、粒度和含量的有效途徑。對黃土高原東南部三門峽盆地的水溝—會興溝舊石器遺址會興溝剖面黃土—古土壤序列(S_0~S_8)進行系統(tǒng)的巖石磁學研究表明:本剖面沉積物的主要載磁礦物為磁鐵礦、磁赤鐵礦和赤鐵礦,顯示準單疇(PSD)磁性顆粒特征。所有磁學參數(shù)曲線均表現(xiàn)出基本一致的變化特征,與深海氧同位素曲線能夠很好的對應,反映了第四紀以來的冰期—間冰期旋回中,東亞季風影響下的風塵黃土堆積中磁性礦物種類、粒度和含量的周期性變化特征。黃土中高矯頑力磁性礦物的相對含量要高于古土壤中的,而隨著成土作用的加強,在古土壤中細粒的低矯頑力磁性礦物顯著增加的同時,其中高矯頑力磁性礦物的絕對含量也相應增加。質(zhì)量磁化率(χ)與非磁滯剩磁磁化率(χ_(ARM))和飽和等溫剩磁(SIRM)及磁粒度參數(shù)χ_(ARM)/SIRM和χ_(ARM)/χ均呈明顯的正相關關系,表明由成土作用產(chǎn)生的單疇(SD)顆粒和較小PSD顆粒對磁化率增強有顯著的貢獻。
[Abstract]:Petromagnetism is the basis of paleomagnetism and environmental magnetism, and the identification of magnetic minerals in rocks and sediments. An effective way of granularity and content. A systematic petromagnetic study on the loess paleosol sequence of Huexinggou section, Huexinggou Paleolithic site, Huixinggou Paleolithic site in the Sanmenxia Basin, southeast of the Loess Plateau, shows that: the sediment of this section is the sediment of this section. The main magnetite bearing minerals are magnetite, Magneto-hematite and hematite show quasi-single-domain PSD) magnetic particle characteristics. All the magnetic parameter curves are basically consistent with each other, which can correspond well with the deep-sea oxygen isotope curves. It reflects the types of magnetic minerals in the aeolian loess accumulation under the influence of the East Asian monsoon during the glacial to interglacial cycles since the Quaternary. The relative content of high-coercivity magnetic minerals in loess is higher than that in paleosol, but with the enhancement of soil-forming, the low-coercivity magnetic minerals of fine particles in paleosol increase significantly. The absolute content of high coercivity magnetic minerals also increased correspondingly. There was a positive correlation between mass susceptibility (蠂 ~ 2), non-magnetic hysteresis remanence magnetic susceptibility (蠂 _ (+)), saturation isothermal remanence (SIRM), and magnetic particle size parameters 蠂 ~ (+ +) ARM / SIRM and 蠂 ~ (+ +) ARMN / 蠂 ~ (2). It is shown that the single domain SDD particles and the smaller PSD particles produced by the soil-forming process contribute significantly to the enhancement of magnetic susceptibility.
【作者單位】： 中國科學院地球環(huán)境研究所黃土與第四紀地質(zhì)國家重點實驗室;中國科學院大學;
【基金】：國家自然科學基金項目“中國黃土記錄的布容正極性時極性漂移事件研究”(編號:41572164) 黃土與第四紀地質(zhì)國家重點實驗室開放基金課題“汾渭地塹早期人類擴散、遷徙與融合證據(jù)”(編號:SKLLQG1502)資助~~
【分類號】：P318.41;P531

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