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2008 Vol. 19, No. 1

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Sedimentation Geochemistry and Environmental Changes during the Late Pleistocene of Paleolake Qarhan in the Qaidam Basin
Fengqin Chang, Hucai Zhang, Yue Chen, Mingsheng Yang, Jie Niu, Hongfang Fan, Guoliang Lei, Wenxiang ZHANG, Yanbin Lei, Lunqing Yang
2008, 19(1): 1-8.
Abstract:

On the basis of the analyses of TOC, CaCO3, δ13Corg, δ18O, and δ13C of the shell bar section in the Qaidam basin, and compared with grain size data, the environmental change history of the high water level of paleolake Qarhan was reconstructed and it could be divided into five stages. From 39.7 to 3...

Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System
Jingxun Zuo, Shanchi Peng, Xuejian Zhu, Yuping Qi, Huanling Lin, Xianfeng Yang
2008, 19(1): 9-22.
Abstract:

This work deals with the evolution of carbon isotope composition in the Luoyixi (罗依溪) Section, a candidate of the Global Standard Stratotype-section and Point (GSSP), defining the base of the as-yet-undefined seventh stage of Cambrian System at the first appearance of the cosmopolitan agnostoid Lejo...

Characteristics of Clay Minerals in the Northern South China Sea and Its Implications for Evolution of East Asian Monsoon since Miocene
Shiming Wan, Anchun Li, Kehui Xu, Xueming Yin
2008, 19(1): 23-37.
Abstract:

Clay mineral assemblages, crystallinity, chemistry, and micromorphology of clay particles in sediments from ODP Site 1146 in the northern South China Sea (SCS) were analyzed, and used to trace sediment sources and obtain proxy records of the past changes in the East Asian monsoon climate since the M...

Morphological Characteristics of (K, Na)-Rectorite from Zhongxiang Rectorite Deposit, Hubei, Central China
Hanlie Hong, Xiaoling Zhang, Miao Wan, Yijun Hou, Dengwen Du
2008, 19(1): 38-46.
Abstract:

The morphological characteristics of the Zhongxiang (钟祥) rectorite have been studied using X-ray diffraction (XRD), electron probe micro-analyzer (EPMA), scanning electron microscopy (SEM), atomic force microscope (AFM), and high-resolution transmission electron microscopy (HRTEM). The structural fo...

Zircon LA-ICP MS U-Pb Dating of the Longkang Andesitic Ignimbrites from Jiuzhaigou: Evidence of the Mianlue Suture Westward Extension
Jiangfeng Qin, Shaocong Lai, Guowei Zhang, Chunrong Diwu, Yong-fei Li
2008, 19(1): 47-53.
Abstract:

Genesis of metasedimentary-volcanics outcroped in Kangxian-Pipasi-Nanping (康县-琵琶寺-南坪) tectonic zone is closely related with tectonic evolution of the Mianlue (勉略) Ocean. In the west end of Kangxian-Pipasi-Nanping tectonic zone, there are hundred meters of andesitic ignimbrites and tuffites. Zircon U...

Sequence Stratigraphic Delineation and Correlation of the Dongying Formation in the Nearshore and Adjacent Sea Areas, Bohai Bay Basin
Hongtao Zhu, Yuansheng Du, Keyu Liu, Jiaxin Yan, Yajun Xu, Ping Yang, Xinyu Liu
2008, 19(1): 54-64.
Abstract:

Based on the analysis of well logs, seismic data, core studies, the Dongying (东营) Formation along the nearshore and adjacent sea areas, Bohai (渤海) Bay basin has been subdivided into three third-order sequences from base to top: namely, sequences SQ1, SQ2 and SQ3. The three sequences have different w...

Simplicial Indicator Kriging
R Tolosana-Delgado, V Pawlowsky-Glahn, J J Egozcue
2008, 19(1): 65-71.
Abstract:

Indicator kriging (IK) is a spatial interpolation technique devised for estimating a conditional cumulative distribution function at an unsampled location. The result is a discrete approximation, and its corresponding estimated probability density function can be viewed as a composition in the simpl...

Euler Deconvolution with Improved Accuracy and Multiple Different Structural Indices
G R J Cooper
2008, 19(1): 72-76.
Abstract:

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Fractal Modeling of Sphalerite Banding in Jinding Pb-Zn Deposit, Yunnan, Southwestern China
Zhijing Wang, Qiuming Cheng, Deyi Xu, Yaosong Dong
2008, 19(1): 77-84.
Abstract:

Sphalerite banding is a common texture in Jinding (金顶) Pb-Zn deposit, Yunnan (云南), southwestern China. The frequency distribution and irregularity of sphalerite grains observed in the bandings are characterized quantitatively by fractal models. Fractal dimensions calculated by several fractal models...

Effect of Multipoint Heterogeneity on Nonlinear Transformations for Geological Modeling: Porosity-Permeability Relations Revisited
J A Vargas-Guzmán
2008, 19(1): 85-92.
Abstract:

An analysis of statistical expected values for transformations is performed in this study to quantify the effect of heterogeneity on spatial geological modeling and evaluations. Algebraic transformations are frequently applied to data from logging to allow for the modeling of geological properties. ...

Monotone Regression and Correction for Order Relation Deviations in Indicator Kriging
Yan Han, Yiheng Yang
2008, 19(1): 93-96.
Abstract:

The indicator kriging (IK) is one of the most efficient nonparametric methods in geo-statistics. The order relation problem in the conditional cumulative distribution values obtained by IK is the most severe drawback of it. The correction of order relation deviations is an essential and important pa...