II. BRIEFLY ANSWER FOLLOWING THE QUESTIONS. 3 questions, 10 marks per question, total 30 marks) (answering questions in Chinese is allowed 1. How many concentra tion processes that lead to the formation of ore deposits are there in our study? their main characters and features? n 2. Which genesic kinds can the ore-bearing fluid be devided into? and explain 3. What are the features of magma? I. EXPLANATION THE MODEL FIGURES WITH GEOLOGICAL CHARATERS OF ORE DEPOSITS ( Choicing to answer 2 questions from 3 questions, 10 marks per question, total20 marks) (answering questions in Chinese is allowed xplanation the formation conditions and processes of epithermal ore deposit by reading the following model figure. VOLCANIC-HYDROTHERMAL SYSTEN GEOTHERMAL SYSTEM sC, HCL CO, Crater lake 2001-300 Hotsprings CO,, Has CO, HO Acidic fluid High sulfidation Cu Porphyry Cu(Mo, Au B Saline magmatic fluid V apor ascent 1 km Schematic cross-section showing shallow sub-volcanic intrusions and assoiatted stratovolcano, and environments deduced for formation of porphyry Cu, and high-and low-sulfidation epithermal ore deposits Active volcanic-hydrothermal systems extend from degassing magma to fumaroles and acidic springs, and incorporate porphyry and/or high-sulfidation ore environments, whereas low-sulfidation are deposits form from geothermal systems characterized by neutral-pH waters that may discharge as hot springⅢ. BRIEFLY ANSWER FOLLOWING THE QUESTIONS. ( 3 questions , 10 marks per question, total 30 marks) （answering questions in Chinese is allowed） 1. How many concentration processes that lead to the formation of ore deposits are there in our study? 2. Which genesic kinds can the ore-bearing fluid be devided into? and explain their main characters and features? 3. What are the features of magma? Ⅳ. EXPLANATION THE MODEL FIGURES WITH GEOLOGICAL CHARATERS OF ORE DEPOSITS (Choicing to answer 2 questions from 3 questions , 10 marks per question, total 20 marks) （answering questions in Chinese is allowed） 1. Explanation the formation conditions and processes of epithermol ore deposit by reading the following model figure. Schematic cross-section shouwing shallow sub-volcanic intrusions and assoiatted stratovolcano, and environments deduced for formation of porphyry Cu, and high- and low-sulfidation epithermal ore deposits. Active volcanic-hydrothermal systems extend from degassing magma to fumaroles and acidic springs, and incorporate porphyry and/or high-sulfidation ore environments, whereas low-sulfidation are deposits form from geothermal systems characterized by neutral-pH waters that may discharge as hot springs