大陆型重晶石电子自旋共振测年信号g=2.002 3的特性

doi:10.3969/j.issn.0253-4967.2025.05.20240033

地震地质 ›› 2025, Vol. 47 ›› Issue (5): 1307-1325.DOI: 10.3969/j.issn.0253-4967.2025.05.20240033

大陆型重晶石电子自旋共振测年信号g=2.002 3的特性

赵琳¹^,²⁾(), 魏传义¹⁾^,^*(), 尹功明¹⁾, 姬昊¹⁾, 刘春茹¹⁾, 杨桂芳²⁾, 徐星烁¹⁾

1)地震动力学与强震预测全国重点实验室(中国地震局地质研究所), 北京 100029
2)中国地质大学地球科学与资源学院, 北京 100083

收稿日期:2024-03-19 修回日期:2024-11-21 出版日期:2025-10-20 发布日期:2025-11-11
通讯作者: *魏传义, 男, 1990年生, 副研究员, 主要研究方向为第四纪年代学与地表过程研究, E-mail: chuanyiwei@ies.ac.cn。
作者简介:
赵琳, 女, 1998年生, 2024年于中国地质大学(北京)获资源与环境专业硕士学位, 主要研究方向为基岩断层区ESR测年研究, E-mail: 1092272251@qq.com。
基金资助:
中国地震局地质研究所基本科研业务专项(IGCEA2208); 中国地震局地质研究所基本科研业务专项(IGCEA2226); 国家自然科学基金(42172211)

CHARACTERIZATION OF ELECTRON SPIN RESONANCE DATING SIGNAL AT g=2.002 3 IN CONTINENTAL BARITE

ZHAO Lin¹^,²⁾(), WEI Chuan-yi¹⁾^,^*(), YIN Gong-ming¹⁾, JI Hao¹⁾, LIU Chun-ru¹⁾, YANG Gui-fang²⁾, XU Xing-shuo¹⁾

1)State Key Laboratory of Earthquake Dynamics and Forecasting, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2)School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received:2024-03-19 Revised:2024-11-21 Online:2025-10-20 Published:2025-11-11

摘要/Abstract

摘要： 重晶石(主要成分为BaSO₄)是自然界中常见的硫酸盐矿物, 其电子自旋共振(electron spin resonance, ESR)信号( $SO 3 -$ )可用于测定海底热液活动、断层运动等地质事件的年代。近年来学者们将ESR方法广泛应用于海底热液场重晶石结晶年代的测定, 但大陆型重晶石ESR测年的相关报道较少, 急需对其ESR信号进行测年基础性质的相关研究, 为大陆环境中重晶石的ESR测年可行性及可靠性提供参考。因此, 文中以大陆环境中沉积重晶石(XBD-B1、 LSJ-B1)及断层重晶石(LJF-B1)为研究对象, 探讨了重晶石ESR信号(g=2.002 3)的微波饱和功率、光敏感性、热稳定性、信号饱和性等基本性质。结果表明: 1)大陆环境中重晶石样品的ESR信号(g=2.002 3)微波饱和功率在0.2~1mW之间, 0.1mW是该信号测量的优选功率。2)大陆环境重晶石样品ESR信号(g=2.002 3)在380℃下加热15min能够完全退火, 信号的热衰减符合二级动力学模型, 常温(20℃)下的热寿命至少能达到10⁶a; 饱和剂量>10 000Gy, 在低环境剂量率的条件下, 综合考虑饱和寿命及热寿命, 2个沉积型重晶石及断层重晶石ESR信号的最老可测年龄分别为152Ma、 72Ma、 1.5Ma。3)断层重晶石ESR信号g=1.999 5和g=2.002 3的热寿命和等效剂量在误差范围内一致, 表明2个测量位置的测年结果具有相互补充和验证的潜力。在实际测年应用中可以综合考虑2个信号测量位置的年龄结果, 以提高结果的可靠性。4)大陆环境中重晶石样品的ESR信号(g=2.002 3)光敏特征类似石英中的Al心, 能够被部分晒退, 应尽量采集未曝光的新鲜样品, 若仅能采集暴露于阳光下的样品, 则应提取不可晒退的信号组分测年。综合来看, 重晶石ESR信号(g=2.002 3)能够用于早更新世中晚期以来断层重晶石结晶年代的测定, 具有一定的可靠性。这为基岩断层活动历史研究提供了一种潜在的测年材料与手段, 也为重晶石矿床的沉积年代测定提供了一种有力的绝对测年手段。

关键词: 硫酸盐, 重晶石 ESR信号, 衰变动力学, 热敏感性, 光敏特性

Abstract:

Barite, a non-metallic mineral primarily composed of barium sulfate(BaSO₄), is widely distributed in nature. Its electron spin resonance(ESR) signal( $SO 3 -$ ) has been used to date geological events such as hydrothermal activity and tectonic movements. In recent years, ESR dating of barite has been extensively applied in seafloor hydrothermal systems; however, studies on continental barite remain limited. This gap highlights the need for fundamental research into the properties of ESR signals in continental settings, providing a basis for assessing the feasibility and reliability of ESR dating.

This study investigates sedimentary barite(XBD-B1, LSJ-B1) and fault-related barite(LJF-B1) from continental environments, focusing on the ESR signal at g=2.002 3. Key properties examined include microwave saturation power, photosensitivity, thermal stability, and signal saturation. Equivalent doses were calculated and compared with results obtained from the g=1.99${9}^{}$95 signal. The main findings are as follows:

(1)The microwave saturation power of the ESR signal(g=2.002 3) in continental barite ranges from 0.2 to 1mW, with 0.1mW identified as the optimal power for accurate signal measurement.

(2)The ESR signal(g=2.002 3) can be fully annealed after heating at 380℃ for 15 minutes. Its thermal decay follows a second-order kinetic model, with a thermal lifetime at room temperature(20℃) of at least 10⁶ years. Under irradiation of ~1${0}^{}$0000Gy, both g=1.99${9}^{}$95 and g=2.002 3 signals remain unsaturated, suggesting high saturation doses. Considering thermal stability, signal saturation, and a 10% decay allowance, the maximum measurable ages for the ESR signals are 152Ma(XBD-B1), 72Ma(LSJ-B1), and 1.5Ma(LJF-B1).

(3)For fault-related barite, the thermal lifetimes and equivalent doses obtained at g=1.99${9}^{}$95 and g=2.002 3 are consistent within error, indicating that results from these two measurement positions can complement and validate each other. Integrating both enhances dating reliability.

(4)The ESR signal at g=2.002 3 in continental barite exhibits photosensitivity similar to Al centers in quartz, with partial bleaching possible. Thus, fresh, unexposed samples should be collected, stored in darkness, and sealed. If only sun-exposed samples are available, non-bleachable signal components should be extracted for dating.

In summary, the ESR signal of barite(g=2.002 3) is suitable for dating the crystallization age of fault barite since the middle to late Early-Pleistocene, demonstrating notable reliability. This study identifies barite as a promising material for ESR dating of bedrock fault activity and as a robust absolute dating method for constraining the depositional ages of barite deposits.

Key words: sulfate, barite, ESR dating, decay dynamics, thermal stability, photosensitivity

赵琳, 魏传义, 尹功明, 姬昊, 刘春茹, 杨桂芳, 徐星烁. 大陆型重晶石电子自旋共振测年信号g=2.002 3的特性[J]. 地震地质, 2025, 47(5): 1307-1325.

ZHAO Lin, WEI Chuan-yi, YIN Gong-ming, JI Hao, LIU Chun-ru, YANG Gui-fang, XU Xing-shuo. CHARACTERIZATION OF ELECTRON SPIN RESONANCE DATING SIGNAL AT g=2.002 3 IN CONTINENTAL BARITE[J]. SEISMOLOGY AND GEOLOGY, 2025, 47(5): 1307-1325.

图/表 14

图 1 重晶石ESR信号谱图测量位置示意图

Fig. 1 Barite ESR signal spectrum measurement position.

图 2 重晶石样品在不同温度下加热15min的ESR谱图

Fig. 2 ESR spectrum of the barite samples with different heating temperatures for 15 minutes.

图 3 重晶石样品ESR信号(g=2.002 3)的强度与微波功率平方根的关系

Fig. 3 ESR signal(g=2.002 3) intensity versus microwave power for barite sample.

图 4 归一化处理后的重晶石样品ESR信号等时退火变化

Fig. 4 Isochronic annealing variation of ESR signal in barite samples(normalized based on the initial ESR signal intensity of the sample).

图 5 归一化处理后的重晶石样品的ESR信号等温退火结果

Fig. 5 ESR signal isothermal annealing results of barite samples(normalized based on the initial ESR signal intensity of the sample).

图 6 重晶石样品等温退火结果的一级动力学拟合结果(lnI与加热时间t的关系)

Fig. 6 Results of first-order kinetic fitting of isothermal annealing results for barite samples(lnI vs. heating time t).

图 7 重晶石样品等温退火结果的二级动力学拟合结果(1/I与加热时间t的关系)

Fig. 7 Results of secondary kinetic fitting of isothermal annealing results for barite samples(1/I vs. heating time t).

表 1 重晶石样品在不同温度下ESR信号(g=2.002 3)的寿命

Table1 Lifetime of ESR signals(g=2.002 3) of barite samples at different temperature

样品编号	温度/℃	回归方程	寿命/min
XBD-B1	240	1/I=7.43×10^-4t+3.32×10^-1	1346
	260	1/I=3.46×10^-3t+3.33×10^-1	289
	280	1/I=1.24×10^-2t+2.78×10^-1	81
	300	1/I=3.23×10^-2t+4.11×10^-1	31
	320	1/I=9.30×10^-2t+4.58×10^-1	11
LSJ-B1	240	1/I=1.63×10^-3t+6.23×10^-1	613
	260	1/I=5.21×10^-3t+6.57×10^-1	192
	280	1/I=1.95×10^-2t+8.08×10^-1	51
	300	1/I=5.66×10^-2t+9.44×10^-1	18
	320	1/I=1.87×10^-1t+5.11×10^-1	5
LJF-B1	240	1/I=4.41×10^-3t+1.23	227
	260	1/I=1.13×10^-2t+1.36	88
	280	1/I=2.51×10^-2t+2.04	40
	300	1/I=8.25×10^-2t+2.08	12
	320	1/I=3.21×10^-1t+2.16	3

图 8 热寿命的自然对数(lnτ)与加热温度的倒数(1/T)的阿伦尼乌斯图

Fig. 8 Arrhenius plot of the natural logarithm of the thermal lifetime(lnτ) versus the reciprocal of the heating temperature(1/T).

表 2 重晶石样品在室温(20℃)下的热寿命及对应最老可测年龄

Table2 Thermal lifetimes of barite samples at room temperature(20℃) and the corresponding lower limit of dating

样品编号	回归方程	寿命/a	最老可测年龄/Ma
XBD-B1	lnτ=1.815×10⁴(1/T)-28.285	7.6×10⁸	152
LSJ-B1	lnτ=1.805×10⁴(1/T)-28.687	3.6×10⁸	72
LJF-B1	lnτ=1.599×10⁴(1/T)-25.541	7.5×10⁶	1.5

图 9 重晶石样品自然ESR信号与被辐照3 240Gy ESR信号谱图的叠加对比

Fig. 9 Comparison of overlapping natural ESR signals and irradiated(3 240Gy)ESR signal spectra of barite samples.

图 10 重晶石样品ESR信号强度随辐照剂量增加的变化

Fig. 10 Variation of ESR signal intensity with increasing irradiation dose in barite samples.

图 11 重晶石样品ESR信号g=1.999 5(a-c)与g=2.002 3(d-f)的附加剂量-响应曲线

Fig. 11 Additional dose response curves of ESR signals at g=1.999 5(a-c) and g=2.002 3(d-f) for barite samples.

图 12 归一化处理后的重晶石样品XBD-B1 ESR信号光晒退结果

Fig. 12 ESR signal solarization results of barite sample XBD-B1(normalized based on the initial ESR signal intensity of the sample).

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大陆型重晶石电子自旋共振测年信号g=2.002 3的特性

CHARACTERIZATION OF ELECTRON SPIN RESONANCE DATING SIGNAL AT g=2.002 3 IN CONTINENTAL BARITE

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