苏北盆地TZK9孔磁性地层及重矿物组合特征研究

程瑜; 李向前; 赵增玉; 张祥云; 郭刚

苏北盆地TZK9孔磁性地层及重矿物组合特征研究

江苏省地质调查研究院, 南京 210049

基金项目:

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

“江苏1：5万港口、泰县、张甸公社、泰兴县、生祠堂镇幅平原区填图试点” 12120114042901

详细信息

作者简介:
程瑜(1989-), 女, 助理工程师, 主要从事古环境研究工作。E-mail:ftchengyu@msn.com

中图分类号: P539.3;P534.63
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- 文章访问数: 197
- HTML全文浏览量: 124
- PDF下载量: 15
- 被引次数: 0
出版历程
- 收稿日期: 2016-06-16
- 刊出日期: 2016-12-01

MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN

The Institute of Geological Survey of Jiangsu Province, Nanjing 210049, China

摘要

摘要: 通过对苏北盆地TZK9孔的磁性地层和重矿物组合分析，探索了该地区晚上新世以来沉积物的物源变化特征。古地磁结果显示，TZK9孔的M/G界线位于250.3 m，B/M界线位于78.5 m，并很好记录了2次正极性亚时（Jaramillo和Olduvai），分别位于129.0~150.2 m与172.55~192.80 m，通过沉积速率外推获得该钻孔的底界年龄约为3.0 Ma。对TZK9孔重矿物组合、特征指数进行分析，并结合淮河及长江下游的重矿物组合特征，揭示在距今3.0~2.6 Ma其沉积物主要来自于淮河流域。而相比晚上新世，第四纪的磷灰石、锆石、金红石、电气石含量增加，表明该地区开始受到了长江流域的影响，而第四纪以来重矿物特征指数（ZTR）逐渐增大可能主要受控于全球气候变化。
- 晚上新世 /
- 磁性地层 /
- 重矿物 /
- 苏北盆地
Abstract: The core TZK9 is located in the northeast Taizhou city (N 32°35', E120°6'), the south of Subei Basin. The main kinds of lithology in the core are clay and silty clay. Some silt, sand and coarse sand are also found. In this study, 382 samples at 30~60 cm intervals were taken for paleomagnetic measurements, and 17 samples for heavy minerals test. Magnetostratigraphic results show that, the M/G and B/M are found at the depth of 250.3 and 78.5 m, respectively. Extrapolation with accumulation rates suggest that the basal ages for sediments in this core is about 3.0 Ma. ATi index was from 50.97 to 100, while GZI index was 11.48 to 77.81, indicating that the source was metamorphic and igneous rocks. During 3.0~2.6 Ma, the main heavy minerals of TZK9 core were ilmenite, epidote, magnetite, garnet and zircon. Comparing the heavy minerals of the TZK9 core with Huai river and Yangtze river, it shows that the sediment came from the Huai river during this time. During 2.6~0 Ma, the main heavy minerals are ilmenite, epidote, zircon, apatite, garnet and magnetite. The content of zircon, apatite, tourmaline, rutile increases compared to the previous period, and it indicates that the Yangtze river begin to influence this area in this period. And the ZTR index gradually increased since 2.6 Ma, which may be related to the change of global climate.
- Late Pliocene /
- magnetic stratigraphy /
- heavy minerals /
- the Subei Basin

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图 1 钻孔位置图

Figure 1. Position of core TZK9

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图 2 TZK9孔典型样品热退磁的剩磁矢量正交投影图

Figure 2. Orthogonal demagnetization plots diagram of typical normal and reversed samples from core TZK9

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图 3 TZK9岩石地层及磁性地层

Figure 3. Lithostratigraphy and magnetostratigraphy of sediments from the core TZK9

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图 4 TZK9孔的深度-年龄关系图

Figure 4. Relationship between age and depth of sediments in core TZK9

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表 1 TZK9孔中主要重矿物含量(%)的垂向变化特征

Table 1. Variations of main heavy minerals content in core TZK9

深度/m	年龄/Ma	锆石	磷灰石	金红石	白钛石	石榴子石	电气石	赤褐铁矿	榍石
6.4	0.06	9.52	1.22	4.41	1.22	3.64	0.38	1.15	1.16
16.6	0.16	6.73	3.73	1.00	0.59	5.11	2.64	3.79	0.09
29.6	0.29	5.11	7.54	3.23	0.49	2.18	3.57	2.98	0.10
37.8	0.38	3.32	5.25	0.72	0.09	1.81	1.09	2.18	0.25
56.0	0.56	10.33	6.46	2.13	2.13	2.94	2.01	1.70	2.13
73.0	0.73	8.33	1.26	2.36	0.38	5.74	1.21	2.42	1.38
89.1	0.82	7.00	10.30	2.47	0.58	2.38	0.85	4.42	0.88
110.3	0.91	5.69	6.69	4.31	0.88	2.44	1.87	4.87	0.69
128.6	0.99	6.57	2.11	1.14	0.59	3.97	0.76	4.74	0.91
142.7	1.04	3.46	1.81	0.47	1.23	7.52	0.41	10.98	3.09
169.2	1.67	10.34	7.68	1.61	1.52	2.56	0.67	1.75	0.19
204.2	2.07	7.34	3.94	2.88	1.58	0.95	1.11	4.44	0.99
223.7	2.29	5.30	1.39	2.47	1.53	1.35	1.35	4.06	0.82
249.7	2.57	7.28	3.93	1.42	0.76	2.90	1.99	3.26	0.41
253.3	2.61	3.01	2.06	0.19	0.55	4.54	0.95	2.27	1.55
273.4	2.84	5.13	1.75	0.48	1.30	4.38	1.01	5.39	1.27
285.5	2.97	1.96	0.34	0.35	0.32	6.86	0.00	6.86	0.17

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表 2 TZK9孔中主要重矿物含量及特征参数的变化

Table 2. Variations of main heavy minerals content and mineral indices in core TZK9

深度/m	钛铁矿	磁铁矿	绿帘石	辉石	角闪石	ATI	GZI	ZTR	风化指数
6.4	43.68	0.00	20.50	2.87	0.00	76.15	27.64	14.32	0.35
16.6	25.68	3.29	21.40	11.69	0.00	58.58	43.15	10.36	0.63
29.6	32.34	0.00	29.96	3.18	0.00	67.86	29.92	11.91	0.58
37.8	25.51	14.25	17.38	12.85	0.00	82.83	35.24	5.13	0.56
56.0	30.98	0.23	26.18	1.08	2.17	76.22	22.18	14.47	0.48
73.0	38.24	14.38	8.16	3.02	4.08	50.97	40.82	11.89	0.20
89.1	26.90	8.15	24.86	1.19	0.00	92.38	25.38	10.32	0.41
110.3	35.22	2.75	23.04	0.00	1.69	78.12	29.97	11.88	0.38
128.6	33.00	11.15	20.48	1.07	4.58	73.42	37.70	8.47	0.40
142.7	28.26	8.47	19.32	2.24	3.25	81.69	68.47	4.34	0.38
169.2	27.57	2.00	24.07	0.94	0.54	91.94	19.82	12.63	0.46
204.2	31.55	4.70	20.77	0.00	0.32	78.05	11.48	11.34	0.35
223.7	40.14	0.00	31.33	0.00	0.85	50.62	20.36	9.12	0.55
249.7	37.70	4.03	26.64	0.00	0.36	66.36	28.48	10.70	0.42
253.3	32.56	10.75	27.26	1.14	3.60	68.48	60.19	4.14	0.55
273.4	35.52	4.71	28.11	0.34	0.67	63.43	46.02	6.63	0.48
285.5	51.73	5.83	16.13	0.00	0.00	100.00	77.81	2.31	0.22

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