察尔汗盐湖区线形沙丘下伏湖相地层的释光年代及其环境意义

doi:10.7522/j.issn.1000-694X.2020.00102

摘要/Abstract

摘要：

本研究尝试使用钾长石多步升温红外后红外法（MET-pIRIR）对察尔汗盐湖北侧线形沙丘下伏古湖相沉积物进行年代测定，并初步探讨其古环境意义。结果表明：钾长石MET-pIRIR₂₅₀法能够得到等效剂量坪区，说明长石信号能够充分晒退并且异常衰减对测年结果的影响可以忽略，从而保证了测年结果的可靠性；古湖相沉积顶部200—180 ka的年代证实了深海氧同位素7阶段柴达木盆地大规模湖泊的存在；上覆地层缺失表明即便在柴达木盆地沉积中心附近，地表沉积物的侵蚀（主要为风蚀）也十分严重，以至于在冰期尺度上也难保证连续性；这一年代结果也表明湖泊的演化并非造成线性沙丘较年轻（3—0 ka）的直接原因。钾长石MET-pIRIR法的应用对解决盆地内中、晚更新世古环境、古气候、地貌演化等问题具有重要意义。

关键词: 柴达木盆地, 线形沙丘, 钾长石MET-pIRIR测年, 等效剂量, 风蚀

Abstract:

Studies of late Quaternary geomorphic evolution and paleoenvironmental changes in the Qaidam Basin had been hindered by chronology. In this study， multiple-elevated-temperature post-IR IRSL （MET-pIRIR） procedure of potassium feldspar was applied to date surficial paleolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region， close to the depocenter of the Qaidam Basin， based on which the palaeoenvironmental implications were discussed preliminarily. The results showed that： An obvious D_e plateau between the stimulation temperatures of 250 ℃ and 290 ℃ indicated the anomalous of the IRSL signals of K-feldspar were negligible， thus ensuring the reliability of the dating results； The ages， ca. 200-180 ka， of paleolacustrine sediments supported the existence of a mega Qaidam Lake during Marine Isotope Stage 7； The absence of overlying sediments indicated severe wind erosion in surficial sediments in the depocenter of the Qaidam Basin， reminding that the sedimentary records were difficult to keep continuous even in glacial-interglacial scale； The huge hiatus between late Holocene linear dunes and mid-Pleistocene lacustrine sediments implies that the late accumulation of linear dunes was not directly hindered by the existence of the mega Qaidam Lake. The application of potassium feldspar MET-pIRIR_{dating will be crucial for the studies of paleoenvironmental， paleoclimatic， and geomorphologic evolution in the Qaidam Basin since mid-Pleistocene.}

Key words: Qaidam Basin, linear dunes, MET-pIRIR dating of K-feldspar, equivalent dose, wind erosion

中图分类号:

P531

曹敏, 于禄鹏, 安萍, 董治宝, 赵俊香, 赖忠平, 王昌盛. 察尔汗盐湖区线形沙丘下伏湖相地层的释光年代及其环境意义[J]. 中国沙漠, 2021, 41(1): 101-110.

Min Cao, Lupeng Yu, Ping An, Zhibao Dong, Junxiang Zhao, Zhongping Lai, Changsheng Wang. Luminescence chronology and environmental implications of palaeolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region[J]. Journal of Desert Research, 2021, 41(1): 101-110.

图/表 6

图1 柴达木盆地的位置（A）、主要地貌（B）及采样点位置（C）1—4：地表年代点[21]；5：贝壳堤[6]；6：雅丹点[20]；7：风成沉积点[35]；蓝线为现代2 710 m等高线

Fig.1 The location (A) and major landforms (B) of Qaidam Basin and samples location(C)

图2 采样剖面

Fig.2 Sections and samples

表1 样品剂量率及测年结果

Table 1 Dose rates and dating results of the samples

样品号	K含量 /%	Th含量 /（mg·kg^-1）	U含量 /（mg·kg^-1）	深度 /m	剂量率 /（Gy·ka^-1）	D_e/Gy		年代/ka
样品号	K含量 /%	Th含量 /（mg·kg^-1）	U含量 /（mg·kg^-1）	深度 /m	剂量率 /（Gy·ka^-1）	CAM	MAM	CAM	MAM
17 CEH4-1A	1.31±0.08	10±0.50	3.3±0.62	20	2.93±0.23	637±30	504±38	217±17	172±20
				10	2.99±0.23			213±17	168±20
				5	3.06±0.23			208±20	165±19
17 CEH4-3A	1.83±0.07	9.7±0.49	2.8±0.68	20	3.16±0.24	648±25	572±42	205±14	181±22
				10	3.22±0.24			201±14	178±22
				5	3.29±0.24			197±13	174±21

图3 样品MET-pIRIR250 的6条生长曲线（A）和SGC De与SAR De比较（B）A中虚线表示平均N值投到不同生长曲线上得到的剂量范围

Fig.3 Six growth curves of MET-pIRIR250 （A） and comparison between SGC Des and SAR Des of samples （B）

图4 17 CEH4-1A衰减曲线（A）、不同温度SGC曲线 (B) 和De 值 (C) 以及全部测片250 ℃ De与290 ℃ De对比 (D)

Fig.4 Decay curves (A), SGC curves (B) and Des at different stimulation temperatures (C) of 17 CEH4-1A and comparison between 250 ℃ Des and 290 ℃ Des of all aliquots

图5 样品De分布及年代模型计算结果 (浅色条：MAM，深色条：CAM)

Fig.5 De distribution and age models results of samples (darker bar: MAM, lighter bar: CAM)

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