江西抚崇盆地晚白垩世-古新世莲荷组砾石砾组分析

梁伟; 陈留勤; 郭福生; 蒋兴波

江西抚崇盆地晚白垩世-古新世莲荷组砾石砾组分析

梁伟^1,,
陈留勤^{1, 2, 3},
郭福生^1, ,,
蒋兴波¹

1.
东华理工大学地球科学学院, 南昌 330013
2.
江西省核资源与环境重点实验室, 南昌 330013
3.
中国地质科学院地质研究所, 北京 100037

基金项目:

博士后科研启动基金项目 DHBHK1102

中国地质调查局工作项目 1212011120836

东华理工大学核资源与环境教育部重点实验室开放基金项目 NRE1210

江西省教育厅科学技术研究项目 GJJ13438

详细信息

作者简介:
梁伟(1988-), 男, 宁夏回族自治区吴忠市人, 硕士研究生, 地质工程专业。E-mail:leungwai1012@163.com

通讯作者:
郭福生(1962-), 男, 硕士, 教授, 主要从事沉积学与区域地质调查研究工作。E-mail:fxguo@263.com

中图分类号: P588.21
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出版历程
- 收稿日期: 2012-11-05
- 刊出日期: 2013-06-01

ANALYSIS ON GRAVEL FABRIC OF THE LATE CRETACEOUS TO THE PALEOCENE LIANHE FORMATION IN FUZHOU-CHONGREN BASIN, JIANGXI

LIANG Wei^1
,,
CHEN Liu-qin^{1, 2, 3},
GUO Fu-sheng^{1
, ,},
JIANG Xing-bo¹

1.
College of Earth Sciences, East China Institute of Technology, Nanchang 330013, China
2.
Jiangxi Key Laboratory of Nuclear Resources and Environment, Nanchang 330013, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 赣杭构造带中、新生代红色粗碎屑岩发育，对红层中砾石组构分析有助于理解红盆形成、演化过程。运用砾组分析方法，对江西抚崇盆地晚白垩世-古新世莲荷组砾岩层的砾性、砾度、砾态及砾向进行分析，并在此基础上对研究区红盆砾岩的物质来源、成因和形成条件等进行综合判断。研究结果表明，莲荷组砾岩为晚白垩世-古新世半干旱-干旱条件下的一套冲积扇相粗碎屑沉积，具有多物源和快速堆积的特点。总体上，砾石成分复杂，风选程度较差，呈次棱角-次圆状，风化程度较低。盆地不同地区砾石成分组合特征具有明显差别，反映了盆地周围复杂的物源供应条件。根据盆地周边出露基岩地层和扁平状砾石产状统计玫瑰花图判断，莲荷组沉积时期，物源主要来自盆地内部的基岩地层以及盆地西南部、西部和东北部。
- 砾组分析 /
- 莲荷组 /
- 抚崇盆地 /
- 赣杭构造带 /
- 红盆
Abstract: Analyzing the gravel fabric of red layers of the Cenozoic in Ganhang tectonic belt is helpful to understand the formation and evolution of the red basin. Using analysis method to study the composition, particle size, shape and preferred orientations of conglomerate layers of the Late Cretaceous to the Paleocene Lianhe Formation in Fuzhou-Chongren basin. The study can estimate the source, origin and formation conditions of these gravels. The result shows that the gravels of the Late Cretaceous to the Paleocene Lianhe Formation were the products of alluvial fan facies in semiarid to arid climate condition. The gravel deposits are featured by multi-source and rapid accumulation, poor sorting, subangular to subrounded and low degree of weathering. The composition assemblages of gravels of different areas in the basin are obviously different, which reflects complex provenance condition around the basin. Based on the bed rock strata characteristics and the rose diagrams from the planes of maximum flat (ab-planes) of gravals, the sediment source was mainly from northern, northwestern and western parts of the basin.
- fabric analysis of gravel /
- Lianhe Formation /
- Fuzhou-Chongren basin /
- Ganhang tectonic belt /
- red basin

HTML全文

图 1 江西抚崇盆地地质简图及砾石统计测点位置

Figure 1. Geological sketch of Fuzhou-Chongren basin in Jiangxi and outcrops for gravel statistics

下载: 全尺寸图片幻灯片

图 2 莲荷组砾岩地层野外露头特征

Figure 2. Outcrop characteristics of the conglomerates of Lianhe Formation

下载: 全尺寸图片幻灯片

图 3 莲荷组砾岩层各轴砾径累积频率曲线图

Figure 3. The accumulative frequency curves of gravel axes of the conglomerate layers of Lianhe Formation

下载: 全尺寸图片幻灯片

图 4 莲荷组砾岩层a轴砾径频率分布柱状图

Figure 4. The histogram map of a-axon size-frequency distribution of the conglomerate layers of Lianhe Formation

下载: 全尺寸图片幻灯片

图 5 莲荷组砾岩砾石ab面倾向玫瑰花图

Figure 5. The rosette diagram of gravel primeval ab-plane of the conglomerate layers of Lianhe Formation

下载: 全尺寸图片幻灯片

表 1 莲荷组砾岩地层砾石成分统计

Table 1. Gravel compositional features of the conglomerate layers of Lianhe Formation

表 2 福克和沃德砾度分布参数计算公式^[16]

Table 2. The calculation formula of Grain size distribution parameters by Folk and Ward^[16]

表 3 莲荷组砾石砾度特征统计表

Table 3. The granulometric features of the conglomerate layers of Lianhe Formation

表 4 莲荷组砾石砾态特征

Table 4. The psephitic features of the conglomerate layers of Lianhe Formation

表 5 莲荷组不同岩性砾石风化程度占比

Table 5. Percentage of weathering degrees of different lithologic gravels from Lianhe Formation

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