SHANGHAI, Sept. 23 (SMM)--LME base metal prices plummeted by over 4% yesterday. Due to worse-than-expected HSBC China’s PMI and weakened PMI in Germany and France, investors concerned the economy will recess, pushing up the US dollar index. As a result, LME zinc prices dipped to USD 1,987/mt, although rallied slightly, prices finally closed at USD 1,995/mt, down USD 90/mt. SHFE 1112 zinc contract prices should open lower, fluctuating between RMB 15,500-15,900/mt. Spot prices should be close to SHFE 1112 zinc contract prices.