PERSPECTIVE

595

Late Ordovician mass extinction caused by global warming or cooling?
Renqiang Liao · Weidong Sun

ORIGINAL ARTICLES

599

In-situ LA-ICP-MS trace element and oxygen isotope signatures of magnetite from the Yamansu deposit, NW China, and their signifi cance
Zhiyuan Sun · Yuwang Wang · Lingli Long

616

Geochemical constraints on the origin of Early Cretaceous alkaline intrusions and its tectonic implication, Sulu Orogenic Belt, Eastern North China Craton
Shen Liu · Caixia Feng · Yan Fan · Kairui Tai · Tianjing Gao · Ian M. Coulson

642

Hydrogeochemical characteristics of groundwater and quality assessment for the purposes of drinking and irrigation in Bougaa area, Northeastern Algeria
Riad Kouadra · Abdeslam Demdoum

655

Organic geochemical characteristics of Eocene crude oils from Zhanhua Depression, Bohai Bay Basin, China
Yujiao Zhang · Hong Lu · Yao-Ping Wang · Xin Zhan · Ping’an Peng

668

Geochronology and geochemistry of magmatic rocks in the Dongzi–Changhanboluo Pb–Zn ore district in Chifeng, Inner Mongolia, and their relationship with metallogenesis
Hongjing Xie · Yuwang Wang · Yunguo Zhang · Wei Jiang · Zhiyuan Sun

698

Zircon U–Pb dating, geochemical, and Sr–Nd–Pb–Hf isotopic constraints on the age and origin of intermediate to felsic igneous rocks at South Altyn, Xinjiang, China
Shen Liu · Caixia Feng · Yan Fan · Xiaoqing Chen · Yuhong Yang · Huibo Zhao · Ian M. Coulson

717

Sources of the Laoxiongdong carbonate-hosted Pb–Zn deposit in Southwest China: constraints from S–Pb–Zn isotopic compositions
Wenyuan Wang · Jianguo Gao · Keyong Wang · Yangxia Nong

733

Evaluation of groundwater geochemical characteristics and quality in the central and Northern Shaanxi Province, China
Hui Yan · Jun Xiao · Ting Liu · Yujie Liu

741

Timing of formation of the Western Jinshajiang and Ganzê–Litang sutures: evidence from the Duocai Granite in the Zhiduo region, West China
Tuofei Zhao · Fengyue Sun · Bo Peng · Chao Wang

760

Determination of the major geochemical processes of groundwater along the Cretaceous-Tertiary boundary of Trichinopoly, Tamilnadu, India
Devaraj Natesan · Chidambaram Sabarathinam · Vasudevan Uthrapathi · Pradeep Kalam · Nepolian Murugesan · Prasanna Mohan Viswanathan · Adithya Vasanthakumari Sivasankara Pillai · Thilagavathi Rajendiran · Thivya Chandrasekar · Banajarani Panda

782 

Genesis of the Maoping carbonate-hosted Pb–Zn deposit, northeastern Yunnan Province, China: evidences from geology and C–O–S–Pb isotopes
Yufan He · Tao Wu · Zhilong Huang · Lin Ye · Ping Deng · Zhenzhong Xiang