新疆西准噶尔地区塔斯特岩体锆石LA-ICPMS年龄及其意义

西准噶尔萨吾尔地区地处新疆阿勒泰地区吉木乃县及塔城地区和丰县。酸性侵入岩在区内较发育，其研究对于准噶尔地区后碰撞构造一岩浆演化时限的厘定具有重要的意义。塔斯特岩体是萨吾尔地区重要的复式花岗岩体，与区内铜、金矿化关系密切。塔斯特岩体锆石LA-ICPMS年龄为337±4Ma（1δ），形成于早石炭世。结合已有的地球化学特征研究，这一年龄显示西准噶尔地区在早石炭世已处于后碰撞环境。本文获得的塔斯特岩体成岩年龄是目前在准噶尔地区获得的最老的后碰撞花岗岩锆石U-Pb年龄之一，为准噶尔地区后碰撞构造-岩浆演化时限的厘定提供了新的证据。     

Freshman Disorientation

Abstract

A Provocative Collection The War against the Intellect: Episodes In the Decline of Discourse By Peter Shaw Iowa City: University of Iowa Press, 1989, 181 pages, $22.50 hardcover, $10.95 paperback. Reviewed by Robert L. Spaeth

Giving Freshmen What They Deserve The Freshman Year Experience M. Lee Upcraft, John N. Gardner and Associates San Francisco: Jossey-Bass, 1989, 443 pages, $32.95 Reviewed by Roy Starling     

Peer Relationships and Emotional Well-Being of Youngsters with Sickle Cell Disease

Comparisons with measures of peer relationships and emotional well-being were made between youngsters with sickle cell disease (SCD) and same-classroom comparison peers. Relative to the comparison subjects, females with SCD were perceived by peers as being less sociable and less well accepted; males with SCD were perceived as being less aggressive than comparison peers. For both males and females with SCD, no other differences were identified on numerous measures of emotional well-being. None of the multiple measures of illness severity were significantly related to measures of psychological adjustment. The common side effects of SCD, chronic fatigue and small physical size, may divert males with the illness from manifesting difficulties related to aggressive behavior with peers. For females with the illness, the common side effects of the illness may hinder the development of normal social relationships. Despite chronic exposure to numerous stressful life events associated with SCD, the youngsters with the illness were remarkably similar to comparison peers, showing evidence of considerable hardiness.     

The affective lives of doubled-up Latinx youth: Influences of school experiences,familism, and ethnic identity exploration

Doubled-up Latinx youth experience many daily challenges associated with ethnic minority status and residential instability. Doubled-up youth share housing with noncustodial caregivers such as friends and/or extended family members primarily because of economic hardship and a breakdown in available parental support. Using data from baseline and 10 days of twice-a-day surveys, this study examined how in-school positive experiences, familism (i.e., a perspective that gives precedence to the family), and ethnic identity (i.e., affirmation, exploration, and resolution) influence after school positive (e.g., feeling joyful/happy) and negative (e.g., feeling stressed/anxious) affect among doubled-up Latinx youth (70% female; M_age = 16.5). Results indicate that in-school positive experiences were associated with more after school positive affect and less after school negative affect. In addition, youth with higher levels of familism reported experiencing less after school negative affect. However, gender moderated the relation of ethnic identity exploration and experiences of after school positive affect. Specifically, females with higher levels of ethnic identity exploration reported relatively lower levels of after school positive affect compared with males. Overall, study findings highlight the importance of both person-level and varying contextual influences on the affective lives of doubled-up Latinx youth.     

Relations between speech and psychology: Accomplishment and aspiration

The Historical‐Critical type of research, one of the four basic approaches to scholarly investigation, is constantly subjected to criticism by persons who conceive of it as less useful than the other types and also by persons who seek to improve it. This article reviews several adverse criticisms in both categories, suggests possible answers to these criticisms, and outlines means of securing the best of quality in this type of research methodology.     

新疆东天山十里坡自然铜矿化区马头滩组玄武岩锆石LA-ICPMS U-Pb年龄及其意义

新疆北部东天山十里坡地区近年来新发现了与玄武岩有关的自然铜矿化这一新类型。自然铜的赋矿地层-马头滩组中的赋矿玄武岩锆石LA-ICPMS年龄为307±4Ma，对应于晚石炭世，显示该套赋矿地层属于上石炭统。从该区自然铜赋矿火山岩所限定的时间看，成矿背景应属于后碰撞环境。东天山十里坡地区自然铜矿化的构造背景、成矿系统和矿化类型与峨眉山玄武岩自然铜矿化和美国基威诺铜矿床均存在差异，自然铜矿化的成因可能也存在差异。     

Language,Educational Television and Young Children

Ninety‐one percent of 227 surveyed teachers of children up to seven years of age (including 101 teachers who monitored educational television series for the Project), in 17 local education authorities in England and Wales, claimed to use educational television broadcasts to assist them with children's language development. However, apart from the nursery teachers, they appeared to put emphasis on language skill acquisition rather than language development, reinforcing the language policy of the schools. Two thirds of the teachers stated that they were catering for children individually when using educational television, although class viewing was the normal practice. The usual method was to watch a programme continuously from beginning to end (even when a video recorder was used) and then to discuss it with the children and to give written work on letter formation, sentence formation, initial sounds, etc., often by filling in worksheets. The teachers were encouraged in this practice by the television series, as these promoted the learning of language and reading skills rather than language development. There was no evidence to suggest that general interest series were used to any extent to enhance language development, in spite of overwhelming agreement by the teachers that television stories, songs and poems were valuable in this respect. A change of attitude by teachers towards language and educational television is desirable, involving the examination of current practices, the analysis of the material presented by broadcasters and the relating of developmental factors to the medium